When Rose is 13 she is chosen to be a messenger of the Great Grey Horse This brave and beautiful creature was, long ago the favourite charger of the vile Lord of the Moor and the animal's heroism in the face of treachery saved a whole village Now he lives on with a mission to protect innocent people from evil, misery and violence Rose is galloped back through time into the heart of the mystery Can she find a way to break the spell of the tragedy? She must not fail him!