Of course, Drearcliff Grange School was haunted.

Amy Thomsett - the girl who flies on moth wings - is confident she can solve any mystery, sleuth out any secret and defy any dark force. With her friends in the Moth Club she travels to London to take part in the Great Game, a contest of skill against other institutes of learning. In a nightmare, and in the cellars of a house in Piccadilly, Amy glimpses a spectre who might have dogged her all her life, the Broken Doll. Wherever the limping ghost is seen, terror strikes. And the lopsided, cracked-face, glass-eyed creature might well be the most serious threat the Moth Club have ever faced.