Fifteen years ago: A teenage girl is viciously assaulted as she picks flowers in a field one night in midsummer. The crime is never reported. Present day: A man with no identification on his person is killed in a hit-and-run. He is never reported missing. Across the city, a priest and his wife are found dead in an apparent suicide. Fredrika Bergman is assigned to the case. What she and her colleagues discover is that a sinister evil, the roots of which date back decades, is the link behind these seemingly unrelated crimes. There's a reason why none of them were ever reported, and it has to do with a shocking and horrendous cover-up unlike anything Fredrika could have possibly imagined.