Frustrated by his department's repressive handling of security for the G8 summit in Genoa, Montalbano seriously considers resigning. His attempt to unwind with a casual swim along the Sicilian seashore fails when he discovers a corpse in the water. The inspector's pursuit of the cause of death intersects with another mystery-the inquiry into a hit-and-run that claimed the life of a young boy who may have been victimized by human traffickers. When Montalbano realizes that he may have inadvertently aided the boy's victimizers, his internal turmoil intensifies

The murder of Angelo Bonpensiero would appear to be the start of a mafia war. Montalbano has his doubts. He is then taken off the case and assigned to investigate the disappearance of a young Ukrainian woman, seemingly unrelated to the previous case he will find out that he should have trusted his instinct after all...