Lester del Rey, founder of Del Rey Books and one of science fiction's Grand Masters, was one of the most prolific science fiction authors during SF's "Golden Age," often writing under several pseudonyms. Police Your Planet was originally published as written by one of his pseudonyms, Eric van Lihn, in 1956. Often better-remembered for his short fiction, Lester del Rey's novels are fast-paced stories that capture the true spirit of 1950's, "Golden Age" science fiction -- stories that attracted so many young readers during their time. Police Your Planet is set on a future Mars where cities are built fast, slums are endemic, and crime is rampant. This is a Mars with cheap grifters, unwashed bums, and "Marsweed" -- smoke it fast, before it kills you! Police Your Planet is pulp fiction for the rocket ship generation -- more back alley action than space-ship battles. Lester Del Rey's fast-paced story gives the same thrills today as it did when it first fell into the hands of its young, enthusiastic readers.