Pille-Riin, who is going into first grade and is nicknamed Stripes, loves animals more than anything else. She even has quite a lot of them at home: a dog, a cat, gerbils, degus, guinea pigs, a garden snake, and a dwarf rabbit. The girl also takes frequent trips to the zoo, where her grandfather works. But when odd things start happening there, it’s up to Stripes to take the reins and clear up the confusion. It’s always good when you have friends to help you solve a complex investigation!