Mechthild lets Nele and Jakob—whose head is almost completely shaved—tag along as she trains to become a tour guide. She gives a particularly vivid account of the story of Gnadensee. In the Middle Ages, people sentenced to death were pushed from a boat into the lake after a bell rang—with a chance to save themselves by swimming …

Early in the morning, two boats are racing across Lake Constance. One of the boats fails to notice an unsuspecting swimmer. The emergency doctor can only confirm the swimmer's death. There is no trace of the driver responsible for the accident.

Amira has been hired as a cleaner by a cleaning company. Her boss, Alex Richmonder, isn't too fond of her and threatens her over the phone while she's removing bloodstains from a yacht and finds a friend's gold necklace.