Your typical Daniel Cohen book on the paranormal: this one, of course, focuses on the Daniken-inspired theories about ancient astronauts. Like most of his books, he keeps a balance between believer and skeptic that leans toward skeptic most of the time. Despite occasionally wandering rather far afield, it's fairly good as an account of the theory that is realistic about exactly how shaky it is, though, and that teaches critical thinking instead of attempting to trick it. ( )