The winner of the 1982 Nebula award for best science fiction novel of the year, No Enemy But Time follows a protagonist whose dreams of prehistoric Africa are so compellingly detailed that he is invited to join a most unusual time travel project. Stranded in the past, he finds love among the Homo habilis he was sent to research. Writes Norman Spinrad, "No Enemy But Time is a science fiction novel of rare maturity and perhaps even rarer wit."