"Crime writer Erica Falck is shocked to discover an old Nazi medal amongst her late mother's belongings. Inspired to dig deep into her past, she visits a retired history teacher for answers. Two days later he's dead. Detective Patrik Hedstro̘m finds that his wife's enquiries appear to have set off a chain of murders and he's finding it hard to keep out of the investigation. A terrible secret from the darkest days of World War II is coming to light...