The Man Who Smiled (original: Mannen som log) is a novel by Swedish crime-writer Henning Mankell, and is the fourth in the Inspector Wallander series, although the English translations have not been published in chronological order.

[1][2] After killing a man in the line of duty (in The White Lioness), Inspector Kurt Wallander finds himself spiraling into an alcohol-fueled depression.

He has just decided to leave the police when an old friend, Sten Torstensson, asks him to secretly investigate the recent death of his father in a car accident.

At first Kurt dismisses his friend's suspicions as unlikely, but then Sten is found murdered in exactly the same manner as a Norwegian businessman shortly before.

Against his previous judgement, Kurt returns to work to investigate what he is convinced is a case of double murder.