Since the owners died under mysterious circumstances over 50 years ago, Germany's oldest smart home has stood empty. Today, when Samira moves in with her family, virtual assistant Cassandra awakens from her decades-long slumber. Developed in the 1970s to take care of a family and out of service after the death of the former occupants of the house, Cassandra now senses a second chance. However, she fancies herself as much more than a fairy godmother who keeps everything in order. Cassandra soon sees herself as an equal member of the family and does everything she can not to be left alone again – with all the means at her disposal.