Surprise! For their seventh birthday, the twins Lukas and Marie are given a mysterious suitcase. It contains everything a real detectives need: a magnifying glass, binoculars, a city map and much more. But it soon turns out that the items in the suitcase have magical abilities! And also a clumsy crook couple is after the suitcase...

The crooks pot and lid are back. They are still chasing after the magical suitcase that the twins Lukas and Marie got for their birthday from their overseas aunt. But the twins have an idea how to outsmart the crooks.

Only - oh fright! - suddenly Paw has disappeared. Will Lukas and Marie manage to save their cat and protect the suitcase?

A mysterious chicken thief is up to mischief. Can the twins Marie and Lukas solve the case? And what do the crooks pot and lid have to do with it? Volume 3 of the turbulent detective series for first-time readers.