This time, Klooz is in the countryside. He goes on vacation, but he doesn't have time to rest! Because on the very first day he arrives, a mysterious plastic cow flies in front of him. And later he finds a tail and two cow bones in his bed. Who wants to scare him? Who is trying to frighten him? Fortunately, Jule helps him - she's a really cool girl.

A detective series for young readers, featuring a nine-year-old boy who has nothing to envy from the heroes of classic detective novels.

The series was awarded the Hansjorg-Martin-Preis in 2006, the most important German award for authors of children's and teen detective books.