Three of author Laura Trenter's highly successful children's crime stories have been adapted for television and are now available as nine 30 minute episodes. Laura Trenter is the daughter of crime novelists Stieg and Ulla Trenter. Sebastian and his friend Amanda stop by the Post Office to buy stamps on their way home from school one day. Suddenly two men burst in, waving sub machine guns in the air and shouting. Afterwards Sebastian begins to see robbers everywhere. Eventually he even imagines the school caretaker to be responsible. Together with Amanda they decide to gather the evidence themselves.