When Otto realized that he saw ghosts and could talk to them, he himself was surprised. Is it true! The boy's pet is also not quite ordinary - it is a talking bat named Vincent, and the animal's character is not a gift. But otherwise, Otto is an ordinary boy who lives on an ordinary street, goes to school and loves solving mysteries... And, as it happens, the secrets were not long in coming. One day, one of the three ghosts living there disappeared from Otto’s house. And it seems he disappeared against his own will - he was kidnapped. Otto and his best friend Emily begin their search! And a mysterious skeleton with a scythe named Creepy Harry will help them...