The One From The Other by Philip Kerr

Set in the aftermath of World War II, the story follows Bernie Gunther, a former Berlin detective turned private investigator, as he navigates the chaotic landscape of post-war Germany. Tasked with finding a missing husband, Gunther uncovers a web of deceit involving Nazi war criminals seeking new identities and refuge. As he delves deeper, he confronts moral ambiguities and the haunting shadows of his own past, all while trying to discern friend from foe in a world where the lines between good and evil have blurred.