Title: Second stage Lensmen
First published: 1953
Description: From back cover of Jove/HBJ paperback October 1977:

**interplanetary spy**

Kim Kinnison was Number One Man of his time.

To him fell the incredible assignment of infiltrating the inner circle of Boskone.  Kinnison's deadly job was to become a Boskonian in every gesture, thought, and deed.  He had to work himself up through the ranks of an alien enemy organization, into the highest echelons of power -- until it was he who would be issuing the orders that would destroy his own civilization!
Subjects: American Science fiction, Fiction, science fiction, action & adventure, Fiction, science fiction, space opera