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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.
Convinced that her family is in danger, Samira attempts to return home. Meanwhile, Cassandra asserts full control over the house.
With Samira out of the house, Cassandra takes her family hostage. In 1972, Cassandra adapts to her new living circumstances.
Fynn goes looking for Steve. Tensions reach a boiling point during Juno's playdate. In 1964, a medical experiment takes a terrible turn.
Feeling isolated, Samira tries to convince David of Cassandra's intentions. In 1971, a mother goes to extreme lengths to protect her son.
Cassandra begins to turn Samira's family against her. Fynn takes an interest in a classmate. In 1971, a woman suspects her husband of infidelity.
Samira moves her family into a 1970s smart home. Her curiosity turns into suspicion when her son reactivates the house's long-dormant AI assistant.