When a six-year-old girl is found dead, hanging from a tree, the
only clue the Oslo Police have to work with is an airline tag
around her neck. It reads 'I'm travelling alone'. Holger Munch,
veteran police investigator, is immediately charged with
re-assembling his homicide unit. But to complete the team, he must
convince his erstwhile partner, Mia Kruger - a brilliant but
troubled investigator - to return from the solitary island where
she has retreated with plans to take her own life. Reviewing the
evidence, Mia identifies something no one else has noticed - a thin
line carved into the dead girl's fingernail: the number 1.
Instinctively, she knows that this is only the beginning. To save
other children from the same fate, she must find a way to cast
aside her own demons and confront the most terrifying, cold-hearted
serial killer of her career...