It's busy at Danny's father's veterinary clinic. Amidst all the sick and injured animals, the vet is looking for an assistant and an annex is being built with new kennels for animals that need to stay overnight. Danny tries to stay out of her father's way as much as possible, but that's quite difficult when there's absolutely nothing to investigate! Luckily, a pet ambulance has recently started operating in the region and works closely with Danny's father, and Danny and her best friend Tofu are often allowed to accompany the kind driver Karel on his rounds. They rescue a hedgehog from a predicament and retrieve an injured cat from a roof. When that cat is then stolen from the clinic, Danny, Tofu, and Pluis immediately start investigating. Will they manage to find the culprit?