Revenge of the Manitou (Rare Vintage Paperback) by Graham Masterton

No one believed little Toby Fenner when he described the man in the wardrobe. A man whose face seemed to grow from the very wood. But by then, things had gone too far. Misquamacus has found a way to return, and this time he won't be beaten so easily.
Revenge of the Manitou is the follow-up to The Manitou, which once again features Harry Erskine, Singing Rock, and a host of Indian stories creating a spine-tingling sequel with some disturbingly horrific passages.