Total Recall by Sara Paretsky

Total Recall  When a man claiming to be a survivor of the Nazi death camps seeks out his family among Lotty Herschel’s circle of friends, he forces her to confront a memory from the war she has long refused to think about. As a frightened V I watches her longtime friend and mentor unravel, she comes to Lotty’s help in the only way she know how—by investigating the survivor’s past. A case of insurance fraud on Chicago’s south side which V I is also investigating leads her to an international conspiracy reaching back to Nazi Europe and gives her the unexpected means to help save her friend.