Time Crime and Other Paratime Stories by H. Beam Piper

TIME CRIME AND OTHER PARATIME STORIES is a collection of stories of a time traveling police force with the mandate to keep secret the knowledge of parallel timeline travel -- partly to avoid chaos, and partly to protect their world's lucrative trade with the people of other timelines.

In TIME CRIME, The Paratime Police had a real headache this time! Tracing one man in a population of millions is easy--compared to finding one gang hiding out on one of billions of probability lines!

• Genesis
• He Walked Around the Horses
• Last Enemy
• Police Operation
• Temple Trouble
• Time Crime

Henry (or Horace) Beam Piper (1904-1964) was an American science fiction writer best known for his extensive Terro-Human Future History series of stories and a shorter series of "Paratime" alternate history tales.  Largely self-educated, Piper worked as a night watchman for a railroad before publishing a series of short stories in the 1950s.  Piper wrote several loosely-related space opera series and several highly-acclaimed novels, one of which, LITTLE FUZZY, won a Hugo Award in 1963.  He committed suicide in 1964.