Former psychotherapist Sebastian Sand has suffers from obsessive-compulsive disorder. The police are asking Sand for help in catching a murderer because he knows exactly what the man's symptoms are.

Die unlösbaren Fälle des Herrn Sand

Eva has mainly cared for her young son in recent years, but now the charming mid-thirties wants to return to her job as an interior designer. The talented designer applies for the equipment of a hip scene, but does not receive any support from either her busy husband or her retired father. In this emergency, the old childhood friend Lucy comes in, who makes the prototypes for Eva's designs in her small carpentry shop. Even as a substitute father for Eva's little son Jona makes the carpenter a good figure.