The Apocalypse Seven by Gene Doucette tells of seven people wake up one morning and slowly realize the rest of humanity has simply vanished.
Dr. Ryland Grace woke up on a space-ship with no idea why he’s there. His crew-mates are dead and the spaceship is millions of miles from home.
Four scientist invented time travel in 1967, however one of them suffers a breakdown and the other three exile her fearing she would jeopardize the project.