A Man Out of Time (Ace Anvil)

Private dick, Ace Anvil, while investigating the murder of a physicist has found a machine that sends messages back in time. Naturally he wants to use it to play the ponies, but instead, he finds himself on a collision course with philosopher assassins, homicidal artists, fanatical vegans, murderous skateboarders, mercenary Baptists and lethal librarians. A lesser man would give up, but Ace can't; a dick is all he knows how to be. Besides, his girlfriend needs new shoes.