The Aliens claim humans can enter the galaxy when and if they develop their own faster-than light drive, but they also stop all research. When an Alien orders Malcolm Fletcher to drop his research, Fletcher joins an eccentric millionaire in a race to develop a stardrive in secret.

Arcturus Landing 1988, Tor Books

ISBN-13: 9780812535464

Mass-market paperback

Arcturus landing 1978, Ace Books, New York

ISBN-13: 9780441028931

2nd Ace edition