A dark and rainy night a girl runs away from an orphanage. The girl seeks out Detective duo Jerry and Maya and asks for their help. Her name is Klara and she is the daughter of the life imprisoned train robber Ferdinand Fransson. Now she needs help to prove that her father is innocent. Lasse and Maya who just got their detective agency shut down by Kristinelund's prejudiced police chief see their chance. They must prove that children can solve mysteries and crimes! But in order to succeed, they must reveal the person behind the mysterious cover ”Marsipan”, the real train robber, who has deceived everyone and threatens to strike again! ALSO AVAILABLE: JERRYMAYA'S DETECTIVE AGENCY - THE FIRST MYSTERY A dark and rainy night a girl runs away from an orphanage. The girl seeks out Detective duo Jerry and Maya and asks for their help. Her name is Klara and she is the daughter of the life imprisoned train robber Ferdinand Fransson. Now she needs help to prove that her father is innocent. Lasse and Maya who just got their detective agency shut down by Kristinelund's prejudiced police chief see their chance. They must prove that children can solve mysteries and crimes! But in order to succeed, they must reveal the person behind the mysterious cover ”Marsipan”, the real train robber, who has deceived everyone and threatens to strike again! ALSO AVAILABLE: JERRYMAYA'S DETECTIVE AGENCY - THE FIRST MYSTERY