Once again, 16-year-old Jonas starts at a new school and, as always, he has no intention of being anybody’s darling. Jonas has muscular dystrophy, is confined to a wheelchair and knows that he will die sooner rather than later from this incurable and progressive disease. His mother Alma, who raises Jonas alone and would rather take a second job than forego therapy for him, is determined to delay his deterioration. She has placed Jonas with Dr. Wildenhahn, an authority on Duchenne disease. The doctor manages to be taken seriously by Jonas, that is until he gets to know Emily, Marianne Wildenhahn's daughter, who goes to his class. Emily has a massively low academic grade, which she hides from her mother because of the doctor’s high standards. Emily falls in love with Jonas, and her sincere affection gives him the courage to love her back. Emily and Jonas become a couple, overcoming all obstacles.
The body of old Theodor Reifenrath is found in Mammolshain in the Taunus. Accident or Murder? Because the safe is open and empty, inspectors Pia Sander and Oliver von Bodenstein start investigations. In the dog kennel in front of the house, they make a horrifying discovery. Alongside to a nearly starved dog, she finds human bones in the ground. Three women's bodies are recovered by the forensic experts. But who are the murdered women? The dead man and his deceased wife Rita had used the large house by the lake as a kind of children's home and had raised many foster children here over the years. However, the two were not loving foster parents. Rita has been missing for many years. Probably suicide, but her body was never found. The investigators are concentrating on the foster children, who are now all grown up and in the middle of life. The pattern of killings is striking: Apparently the perpetrator always kills on Mother's Day. And that day is near.
