#1 of 4 in Wayfarers
#1 of 4 in Remembrance of Earth's Past
#2 of 4 in Wayfarers
#3 of 4 in Wayfarers
5 The Machineries of Empire
#1 of 3 in The Locked Tomb
#1 of 3 in Children of Time
#1 of 2 in Monk and Robot
#2 of 2 in Monk and Robot
#1 of 1 in Nothing is Promised