Ordeal is a novel written by William W. Johnstone. It was first published in 1998.
Miles from civilization, a hiking party has embarked on a wilderness weekend with little more than their wits and a lust for adventure to guide them. But Montana's Bitterroot Mountains harbor an enemy far more dangerous than the rugged elements of the wild. With cunning patience, a stranger is watching and waiting to exact a nightmare plan. Soon, four friends will be led down a twisting trail to the outer fringes of his dark obsession with only one route of escape.