The Ringworld engineers
Larry Niven
Ringworld (2)
Death of a Prankster
M. C. Beaton
Hamish Macbeth (7)
Destined to Last
Alissa Johnson
The Battle of the Labyrinth
Rick Riordan
Percy Jackson and the Olympians (4)
Out of the Silent Planet
C. S. Lewis
Space Trilogy (1)
Perelandra
Space Trilogy (2)
That Hideous Strength
Space Trilogy (3)