Maisie Hitchins longs to be a detective. She's sure there are lots of adventures to be had on the streets of Victorian London. And, together with her faithful puppy, Eddie, she is determined to follow even the slightest scent of a mystery - no matter what!

Maisie's best friend, Alice, has disappeared from her fancy new boarding school. The only clue is an inkwell spilled across Alice's desk, and a trail of suspicious paw prints. Will Maisie be able to find her friend before she ends up in real danger?