Just days after the Liberation of Paris, US Army Detective Billy Boyle and Lieutenant Kazimierz are brought to Saint Albans Convalescent Hospital. Billy's love and Kaz's sister have been taken to Ravensbruck.This news is brought by British Major Cosgrove, who asks Billy for help, unofficially, in solving what he thinks was the murder of a British agent recuperating at Saint Albans. The convalescent hospital is really a secret installation for those in the world of clandestine warfare to recover. When a second body is found, it is evident that a killer is at work in this high-security enclave.