When a gentleman arrives at Montalbano's police station to report an armed robbery on his wife that ended with a kiss, the inspector's suspicions are aroused. As he delves deeper into the case, Montalbano finds that none of the witnesses' stories are adding up, and he can't help but feel that they're not meant to.

When a body turns up showing all the signs of a mafia hit, the inspector knows he must excavate the truth from what he is being led to believe. Meanwhile there's a case that keeps winding its way back to Montalbano's office. A locked door has suddenly appeared on a farmer's disused shed, and then, just as quickly, the door disappears.

The anti-terrorist police soon intervene, but why are they so keen to keep this away from the inspector? And why does he sense that this case is connected to him somehow?