Seven friends - three women and four men - meet for dinner. Everyone should put their cell phone on the table. No matter what message comes in - anyone can read it and listen to the phone calls. However, this leads to a lot of chaos.

Lawyer Dominique Kuster can feel a professional success for herself when her underage client Stefan, the oldest of three foster children, receives mitigating circumstances. After the court hearing, however, she found out that the foster father Christian Hunziker had a fatal accident in a car. An autopsy reveals that it was murder. Someone has swapped the dead man's insulin for ineffective water. Christian's wife Martina comes under suspicion.