After bidding on and purchasing a horse for a wealthy American woman, ex-jockey Johah Dereham finds that his client is not the only person who desires the animal.
Although none of them believe in ghosts or monsters, four youngsters and their Indian guide begin to get nervous when they find strange large footprints around their camp.
Miranda, aware that she has two clones, one living with her and the other under the guardianship of Dr. Mullen, begins to suspect there is a fourth clone when she starts getting in trouble for things she did not do.
Will and Arthur's friendship is tested when they join with Catface in an effort to prove that Blackfoot Wilfred Black was murdered in 1917 and not killed in the World War I battle at Vimy Ridge as everyone had been led to believe.