Maisie Hitchins longs to be a detective. She's sure there are lots of mysteries to solve on the streets of Victorian London - if only she weren't so busy running errands for her grandmother. When Maisie rescues an abandoned puppy, he quickly leads her to her first case. George, the butcher's boy, has been sacked for stealing, but Maisie's sure he's innocent. It's time for Maisie to put her detective skills to the test as she follows the trail of the missing money.