In 1980s Sweden, Ord Salamon is helping Sara Bergwall find a book her father Jonatan wrote just before he died. He soon discovers that Jonatan was investigating the weapons industry, and more specifically some covert affairs with foreign dictatorships. But more questions arise. What is the book about, and why does Sara want Ord to find it for her? Did her Alzheimer’s-stricken mother know the secret before she grew too demented to share it? And how did Jonatan actually die?