Peter’s dog Nell has an amazing sense of smell. Her ever-sniffing nose is always hard at work solving mysteries and finding all Peter’s lost toys. But Nell has other talents too . . .When she’s not cracking cases, Nell goes to school with Peter and listens to the children read books about dinosaurs, books about space and even books about dogs – Nell loves them all! 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!