Paratime

H. Beam Piper's "Time Crime" is part of his series of alternate history stories which concern the Paratime Police, a law enforcement outfit from a parallel world which has learned how to move between timelines. They jealously guard the secret, even as they mine other worlds for their resources. Notably, it appears that humans are in fact Martian refugees who escaped a calamity on their home planet and migrated to Earth!

"Last Enemy" is a science fiction story written by H. Beam Piper, and is a part of his "Paratime" series. The title is a reference to 1 Corinthians 15:26, "The last enemy that shall be destroyed is death." (KJV) It made its first appearance in August 1950, in Astounding Science Fiction magazine (now Analog). The story begins at a dinner party given by Garnon of Roxor. The party is a voluntary discarnation feast, or suicide party.