Second Stage Lensman Books in Order

The dragonlike Lensman Worsel investigates an inorganic uprising after an apparent victory over Civilization's enemies. Joining a mysterious expert on robots, he discovers a hidden threat and secrets that could shake the Galactic Patrol itself.

Tregonsee becomes the target of an assassination attempt by an unknown enemy controlling portals through space-time. The Rigellian Lensman must confront a power capable of moving anywhere in the universe without leaving a trace.

A threat from another universe puts Civilization in danger of a Boskonian attack. Nadreck, an extraterrestrial Lensman with extraordinary multidimensional abilities, becomes the crucial defender against an enemy others lack the power to stop.