Dominique Kuster can only briefly rejoice over the mild sentence she got out for her 17-year-old client Stefan after a fight. Because on the way to court his foster father Christian Hunziker was killed in a car accident.

Borchert and his boss Dominique would like to assist the widow Martina, who already has problems with the youth welfare authorities, and her three foster sons. Meanwhile, the police make a surprising discovery: There was only water in the insulin capsule of the diabetic Hunziker! For Captain Furrer - according to the murder statistics - the wife is immediately the main suspect. Soon a motive is also found, because Hunziger had a mistress who was expecting a child from him. A natural child that Martina could never give him.

However, Borchert does not believe in a crime of rage. In order to exonerate Martina and to prevent Stefan and his two brothers Hassan and Max from being torn apart again, the "lawyer without a license" follows every trace, no matter how small. And so he discovers that real estate investor Frick does not shy away from blackmailing the good-natured old landlady of the Hunzinger family. But how did he get the information?

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