Lis Castrop is a world-class chef. After years in a London gourmet temple, she is tempted by a dream offer: the billionaire Harman family hires her and her daughter Cosima exclusively for their magnificent residence in Davos. But on New Year's Eve, the feast turns into a nightmare: the Harman couple and their two children fall victim to a poison attack at dinner. Lis is the only witness - and she is also one of the victims: still alive, but poisoned. She has caught a small dose of poison, and she has five days left until certain death. Desperately, Lis tries to buy time with Cosima. In order to protect her daughter, however, she has to solve the murder case - while the poison ticks in her blood.