Raven Mysteries: Magic and Mayhem: Book 5 by Marcus Sedgwick
Join the wonderfully weird Otherhand family and their faithful guardian, Edgar the raven, and discover the dark secrets of Castle Otherhand.
A trip to the circus has far-reaching consequences for the Otherhands when Fellah goes missing. Before long the Castle is plagued by a duck, a suspect fortune teller, and several cartloads of lethal cabbages. The family is preoccupied: Valevine is busy inventing a cabbage-counting machine; Minty is waiting to hear the secrets of the universe; and Solstice has discovered that Cudweed is concealing three hundred and forty-two rabbits in his bedroom. When chaos strikes and thieves infiltrate the Castle, it falls to Edgar to extract his family from a very fluffy predicament.
Dedicated website on Raven Mysteries: www.ravenmysteries.co.uk