American Alana Eastwood's grandfather, and her only living relative, has taken ill at his home in Germany. Alana travels to be by his side, and while staying at his country cottage, she finds an unopened letter, postmarked 1945, that thrusts her into one of the most notable unsolved mysteries from postwar Germany. When people turn up dead, the local police are ill equipped to grasp the entire chain of events that the mysterious letter has put into play. It takes investigators Sigmund and Andrew Griegg to connect the police enquiry to neo-Nazis, Mossad, and a secret hidden in "the trap" for so many years . . . but it's the American who holds the link that breaks the chain and solves the mystery.