Rag and Bone (Billy Boyle World War II Mystery)

Billy is sent to London in the midst of a Luftwaffe bombing offensive to investigate the murder of a Soviet official. There's reason to believe that the crime could be connected to the recent discovery of mass graves in the Katyn Forest, where thousands of Polish officers were executed. Is a killer is out there, targeting Soviet officials in revenge for the Katyn Massacre? If so,the diplomatic stakes couldn't be higher as the uneasy relationship between the Soviets and the other allied powers hangs in the balance. Further complicating matters, Scotland Yard names Billy's friend Kaz, now working for the Polish government in exile, as the prime suspect. Billy must track the killer through London's criminal underworld and save his friend.