Mother of an autistic boy is found murdered in her home. The boy holds the murder weapon, covered in blood..
Ximena and Theo have been to tivoli Gröna Lund together. Ximena has just missed the last metro train home when a mysterious, silver-colored train rolls onto the platform. Theo thinks the train looks strange and tries to stop Ximena in vain. The next day, Ximena is not really herself anymore.
Moa is in her early 20s, works at a factory and lives by herself in a cottage in the forest. She is a vegan and follows her friends and demonstrations, mostly to fit in. But at home, by herself, she listens to pop music and use make-up.
Beck follows Swedish police officer Martin Beck and his team as they investigate various crimes.
