House of Darkness — Jean Phillips

She was tormented by a house of evil and a Mayan curse.

Secret Passageway to Death.

Helen heard the scream. It was like nothing she had ever heard before … almost human, yet not. She turned, then backed away in horror. Standing on his hind feet and pawing the air with deadly forefeet was the mysterious killer stallion, his lips parted to show his great white teeth, his nostrils dilated and quivering. The only possible means of escape was a ladder leading to a loft … and death itself barred the way…