Retirees Karin, Gerhard and Philippa are not in the mood for Nordic walking and seniors' courses at the university. When Philippa, who is living life to the full as Leonie's godmother, helps the two to unexpected grandparenthood, they suddenly have two "lively" god-grandchildren to look after, a huge bouncy castle standing in the garden and Lego bricks stuck to their feet.

A perfectionist meets a chaos queen. When the doctor Konstanze receives a surprise visit from her lively rehab friend Jackie and her children, the house is soon turned upside down. A big challenge for the tidy doctor, but also a great opportunity to improve her poor social skills. But in contrast to the very different women, their children get along splendidly.

A man and his ship are sunk in Lake Constance and the dead man's son is missing. For the detectives, he is the prime suspect. Until an anonymous tip-off about a prisoner hidden in a box turns up...