My friend Conni - Gehemnis Um Kater Mau

Conni is going on a big trip for the first time without her family! Of course, her best friends Anna and Simon are joining her, but she can't take her cat Mau along. As soon as they arrive at the youth hostel near the old castle mill, Conni discovers that Mau has sneaked in as a stowaway. However, pets are not allowed in the accommodation, and to make matters worse, Mrs. Weingärtner, the owner of the youth hostel, is allergic to cat hair. Conni tries to hide Mau, but the mischievous cat is not bothered by that at all. He curiously explores the surroundings and causes a lot of trouble. Mrs. Weingärtner blames her son's pet, the sweet raccoon Oskar, and wants to send him to the zoo. And then, in a strange turn of events, things start disappearing from the hostel. Conni and her friends must act quickly: Will the children manage to save raccoon Oskar, tame Mau, and find a real thief?.