When Detective Dog Nell puts her nose to the task, there's no mystery she can't solve. Whether she's tracking the missing shoe of her human, Peter, or locating some lost honeycomb, all Nell has to do is sniff, sniff, sniff and she's hot on the trail. Besides solving mysteries, there's something else Nell loves--listening to children read. Every Monday, Peter takes her to school where children tell her stories. One day, Nell and Peter arrive to find that all the books are gone. Who could have taken them? And why? There's only one dog for the job, and Detective Dog Nell is ready to sniff out the thief!