A mother and daughter are on their way to Stockholm to celebrate the daughter's 14th birthday. On the train, the mother starts acting weird and the daughter fears that another psychotic episode is about to take possession of her mother. Despite the symptoms, they try to continue the vacation as planned. When the mother's condition worsens, the daughter is left by herself and gets to explore Stockholm on her own for a few magical, solo days and nights. Psychosis in Stockholm is a heightened drama about a fantastic and unconditional mother-daughter relationship.