When Caro Monday's mother disappears on one of her jaunts, Caro has no choice but to go and stay with a miserable woman that she's never met. Not only that, but she's told that her beloved rabbit, His Nibs, is not allowed to go with her.

Luckily, Caro's not one for following rules. With her rabbit in hiding and her wild behaviour getting her into trouble as soon as she walks through the door, Caro is only going to find herself in deeper water. In the lining of her suitcase is a small but extraordinary painting of a starling - a painting that some dangerous art thieves are hunting down!

Can Caro and her friends solve the mystery of the stolen songbird and find its owners before it's too late? Here ensues an exciting dash across London, with twists and turns as plentiful as the cobbled streets Caro and her friends must navigate!