His memory is going to pieces and he is no longer officially on duty, but Wallander draws on all his resources to find Linda’s missing father-in-law, a former top official in the Swedish navy, obsessed with a decades-old submarine mystery. Slowly losing his grip on reality, Wallander is desperate to solve this one last case.

A woman’s knife-slashed corpse leads Wallander on a chase for the victim’s missing daughter, inciting him to a grievous oversight. In his private life, he bonds with Linda’s father-in-law, a retired naval officer, who gets a menacing birthday greeting. Convinced that something is not right with his brain, Wallander sees a doctor.

Wallander becomes involved in the search for a missing Swedish woman while in South Africa for a police conference. At the same time, he finds himself experiencing worrisome blackouts and dizzy spells.