Peter’s dog Nell has an amazing sense of smell. She is always hard at work solving mysteries and finding all Peter’s lost toys. When she’s not cracking cases, Nell goes to school with Peter and listens to the children read. But one day Peter and Nell arrive at school to find all the books have disappeared! Who could have taken them, and why? Luckily, Detective Dog Nell, with help from the whole class, is ready to sniff out the thief!