The Stainless Steel Rat's Revenge by Harry Harrison

In this thrilling science fiction adventure, the cunning and charismatic master criminal, "Slippery Jim" DiGriz, finds himself on a mission to thwart a menacing interstellar threat. Tasked by the Special Corps, DiGriz must infiltrate the militaristic society of Cliaand, a planet bent on galactic conquest. As he navigates through a web of deception, espionage, and high-stakes danger, DiGriz uses his wit and charm to outsmart his adversaries, all while grappling with moral dilemmas and the complexities of loyalty. The narrative is a blend of humor, action, and clever twists, showcasing DiGriz's unique brand of justice in a universe teetering on the brink of chaos.