The retired building contractor Arno Adelmann lives with his prudent housekeeper Nancy in a stately villa on Lake Constance. At first glance, the 77-year-old oddball seems a bit cranky; For example, when he shoots molehills with his double-barreled shotgun because they spoil his beautiful lawn. Ultimately, however, his heart is in the right place - even after the heart attack three years ago. When he sees his new neighbor Ina being coldly ripped off by a shady construction company during her renovation, he offers the nice pharmacist his generous support. Until her dilapidated house is properly repaired, Arno lets the single mother live with her little daughter Caro in his already almost empty villa. Alarm bells immediately ring for Arno's daughters Thekla and Bianca as well as his sons-in-law Bert and Theodor. In the eyes of her "dear relatives," Ina is nothing more than a sophisticated inheritance hunter who is after Adelmann's millions. In order to forestall this "bitch", Thekla and Bert try to obtain Arno's incapacitation with a costly psychiatric report. The suicide of Arno's eccentric girlfriend Romy plays a key role in the devious plan. There's some detective work to be done for Ina and the clever housekeeper Nancy.—ADR Das Erste

The somewhat grumpy but basically amiable former building contractor Arno Adelmann literally comes alive when he temporarily takes in his neighbor, the young pharmacist Ina and her little daughter Caro, in his villa. Adelmann's scheming daughters and sons-in-law, however, are convinced that the stubborn old man is squandering his fortune on a cunning heiress.