When a childhood friend suddenly dies Rebecka Martinsson returns home to the north of Kiruna. But not everything is what it seems.
Kid detectives Lasse and Maja put their crime-solving skills to the test for the first time when a valuable, ancient text is stolen.
Lasse and Maja have had their detective agency shut down by the police chief when a customer ask for help to prove her father is innocent of the train robbery he was convicted of. Lasse and Maja now see their great chance to show off