Introduction

When H. Beam Piper sat down to write the stories that would become Time Crime, he was working at the height of his powers within one of the most ingenious frameworks in all of science fiction: the Paratime Police. To pick up this book is to step into a universe that Piper built with the patience of an engineer and the imagination of a born storyteller—a universe where the boundaries between worlds are not the walls of distant galaxies but the invisible partitions between alternate versions of our own Earth. What follows in these pages is a chase, yes, and a crime story in the truest sense, but it is also a meditation on order, civilization, and the terrible responsibility that comes with power no other people in any reality possess.

This modern translation has been prepared with a single guiding purpose: to make Piper’s brilliant, intricate vision accessible and thrilling to readers today, without sacrificing the texture, intelligence, and moral weight that made his work endure long after his lifetime. The language has been carefully refreshed, the pacing tuned for the contemporary ear, and the occasional dated reference smoothed so that nothing stands between you and the story. What has not been changed is the heart of the thing—the relentless logic of Piper’s plotting, the crisp authority of his characters, and the sweeping grandeur of the worlds he invites you to visit. Before you begin, allow this introduction to orient you, to deepen your appreciation, and to set the stage for one of the most satisfying adventures the golden age of science fiction ever produced.

Henry Beam Piper was, in many ways, an unlikely architect of so vast and disciplined a fictional cosmos. Born in 1904 in Altoona, Pennsylvania, he was largely self-educated, a working man who spent years as a laborer and night watchman for the Pennsylvania Railroad while quietly amassing one of the most formidable private libraries imaginable and teaching himself history, anthropology, linguistics, and the hard sciences. He read voraciously and remembered everything. That habit of disciplined, omnivorous study is the foundation upon which his fiction rests, and it is the reason his invented worlds feel so unnervingly real. When Piper describes a society, an economy, a system of governance, or the mechanics of a technology, he does so with the confidence of a man who has thought through every implication. Nothing is decorative. Everything connects.

Piper began publishing in the 1940s and rose to prominence in the 1950s and early 1960s, the era when Astounding Science Fiction under John W. Campbell set the intellectual tone for the entire genre. Campbell prized stories that took an idea—any idea—and pursued it rigorously to its logical conclusions, demanding that the fiction be as much a thought experiment as an entertainment. Piper was a natural fit for this philosophy, and the Paratime series, of which this book is a centerpiece, represents perhaps his purest fusion of speculative rigor and pure narrative momentum.

His career, however, was marked by a quiet tragedy that lends a particular poignancy to the act of reading him today. In 1964, beset by financial difficulties he believed to be insurmountable and apparently convinced that his writing career had stalled, Piper took his own life. The cruel irony is that he was wrong about nearly all of it. His agent had in fact sold work and secured money he never knew about; his reputation, far from fading, was on the cusp of a long and durable resurgence. In the decades since, his books have been reprinted again and again, his ideas have influenced generations of writers, and readers continue to discover the elegance of his craft. There is something deeply moving about encountering an author whose confidence in his own work faltered at precisely the moment when posterity was preparing to vindicate him. As you read, you are participating in that vindication. You are proving, with your attention, that the worlds Piper labored to build were worth building, and that they have outlasted the despair of their creator.

It helps to understand the specific genius of the Paratime concept, because it is the engine that drives everything in this book. Piper’s premise begins with a single, audacious idea: that there exists not one Earth but an effectively infinite number of them, arranged across what he called the “lateral dimension” of probability. Every choice that could have gone otherwise, every historical fork that could have been taken differently, has in fact been taken in some parallel timeline. There are Earths where the great civilizations of antiquity never fell, Earths where they never rose, Earths where humanity itself developed along utterly different lines. This is the multiverse, decades before the word entered popular vocabulary, rendered not as a gimmick but as a fully realized cosmological framework with its own internal physics and its own moral consequences.

Crucially, only one civilization across all these countless worlds has discovered how to travel between them. This is the home timeline of the First Level—a society descended from a people who, in their own deep past, exhausted their planet’s resources and survived only by learning to siphon what they needed from the unsuspecting alternate Earths of the other “levels.” That dependence created a need, and that need created a secret. The entire prosperity of First Level civilization rests on a foundation that must never be revealed to the worlds it quietly exploits. To protect that secret—and to protect the parallel worlds from the chaos that would follow if the technology were ever loosed among people unready for it—exists the Paratime Police.

It is impossible to overstate how clever and how productive this setup is as a foundation for storytelling. The Paratime Police are at once a detective agency, a peacekeeping force, an intelligence service, and a kind of cosmic civil-defense organization, charged with maintaining what is called the Paratime Secret across literally innumerable worlds. Their jurisdiction is the entire probability dimension. Their criminals can flee not merely to another city or another country but to another reality altogether, where the laws are different, the technology is different, and the very assumptions of civilization may be unrecognizable. And their fundamental constraint—the rule that gives every story its tension—is that they must accomplish their work without ever letting the outtime peoples discover that they exist or that travel between worlds is possible.

This single constraint transforms every operation into a delicate, high-stakes exercise in discretion. A pursuit cannot simply be a matter of overwhelming force, because overwhelming force leaves traces, and traces raise questions, and questions threaten the Secret. The Paratime agent must blend in, must understand the local culture deeply enough to pass within it, must solve the immediate problem while leaving the larger illusion intact. In the hands of a lesser writer, this might become a tedious set of restrictions. In Piper’s hands, it becomes a source of endless ingenuity, forcing his characters to think their way through problems that cannot be solved by brute strength alone. The result is intelligent action: chase and confrontation grounded in cleverness, anthropology, and hard-won expertise.

At the heart of this organization stands Verkan Vall, one of the genre’s most quietly compelling protagonists. He is a senior agent of the Paratime Police, a man of formidable competence, deep cultural knowledge, and an almost serene professional confidence. What makes Vall such a satisfying figure to follow is that he is not a superhero and not an everyman, but a true expert—the kind of operative whose authority comes from genuine mastery rather than from luck or raw power. Watching him work is like watching any great professional at the top of their field: there is pleasure simply in the competence, in the way he reads a situation, marshals resources, anticipates the moves of his quarry, and adapts when his plans collide with the messy contingencies of the real. Piper trusts his readers to find satisfaction in intelligence, and he is right to.

The crime at the center of this story is no ordinary one. The Paratime Secret is not merely an abstract principle to be defended in the way a bureaucracy defends its protocols; it is the thin membrane upon which the safety of countless worlds depends. When that membrane is threatened—when criminals exploit the very technology meant to be the most closely guarded knowledge in existence—the consequences ripple outward in ways that can destabilize entire timelines. The investigation that unfolds in these pages is therefore a matter of genuine gravity. The stakes are not the fate of a single person or even a single world but the integrity of the whole system that keeps the worlds apart and at peace. And because the criminals can move laterally across the probability dimension just as the Police can, the chase becomes a true contest of skill and will across realities, each with its own rules, its own dangers, and its own moral landscape.

What elevates the narrative beyond pure adventure is the way Piper uses the alternate worlds as windows onto questions about civilization itself. Each timeline the story touches is a kind of thought experiment about how a society might be organized, what values it might hold, what cruelties it might tolerate or institutionalize. Some of these worlds are deeply uncomfortable to contemplate, and Piper does not flinch from depicting societies built on slavery, exploitation, and casual brutality. He is not endorsing these systems; he is examining them, holding them up against one another and against the assumptions of his own characters, asking the reader to consider what makes a civilization just or unjust, stable or doomed. This is the genre at its most valuable—using the freedom of the speculative to illuminate truths about power, order, and the human capacity for both cruelty and decency that a strictly realistic narrative could never approach.

It is worth pausing here to acknowledge something for the contemporary reader. Piper was writing in the 1950s, a man shaped by his time, and the worlds he invents include depictions of societies organized around domination and the trafficking of human beings. These are presented as the practices of alien or corrupted timelines, as moral problems to be confronted rather than as endorsements, but a modern reader will rightly bring a sharpened sensitivity to such material. This translation preserves the essential moral architecture of Piper’s vision while presenting it in language suited to today. The intent throughout has been to honor what Piper was attempting—a clear-eyed look at the varieties of human social organization across the probability dimension—while ensuring that the reading experience remains fluid and undistracted. The villainy in these pages is meant to be recognized as villainy, and the moral seriousness with which the Paratime Police regard their charge to protect the vulnerable across the timelines is one of the work’s quiet strengths.

There is also, running beneath the surface of all the action, a fascination with the very nature of order. The Paratime civilization is, in its own way, an empire of secrecy, a society whose entire way of life depends on a deception maintained across infinite worlds. Piper does not present this uncritically. He is interested in the cost of such an arrangement, in the discipline it requires, in the moral compromises it entails, and in the constant vigilance necessary to keep the whole improbable structure from collapsing. The Paratime Police are heroes, but they are heroes burdened by an almost impossible responsibility, and the best moments in the story arise precisely from the tension between their personal decency and the cold imperatives of the system they serve. This is what gives the adventure its weight. It is never merely a question of catching the criminals; it is a question of what the pursuit reveals about the pursuers, and about the price of maintaining a civilization on a foundation that can never be openly acknowledged.