Roger Andover will inherit a fortune if he marries. But he is a solitary man with no ambition: human relationships mystify and dismay him. But to present a life-like female android as your wife: surely that will satisfy everyone? Andover finds more than he bargained for when his robot bride challenges his preconceptions about humanity.

Why take the Great Circle route to Australia when you can tunnel through the very molecules of the solid earth itself in a TAU-mode shuttle? When a routine TAU-shuttle becomes entombed in solid rock miles under the earth, the only means of rescue may be the wildly experimental LAMBDA-mode shuttle; and even its creator has no idea how it will behave, or whether its pilot can keep his sanity during the rescue mission.