Sid Halley, ex-champion jockey turned investigator, is facing his toughest test.
A number of horses have been brutally mutilated, horrifying their owners and the general public. Even Sid's friend, broadcaster Ellis Quint, has been moved to make a shocking programme about it.
But when Sid is asked to look into the case, the evidence he uncovers points in a startling direction and he finds that his head must overrule his heart.
As friends and associates are angered by his discoveries, so Sid is drawn into a terrible web of conspiracy and intrigue. Escape will require all his legendary wits and cunning . . .