Black Mercy Falls by Christopher Fulbright

The small Colorado town of Black Mercy Falls has a ghastly past. The massive waterfall above the town runs thick with black iron oxide, but there are hushed suggestions that something evil is responsible for the dark waters. Whispers of the locals connect a list of missing children with a diabolical tale of the town's founding father. Is the waterfall haunted? Or is the town cursed by something that stalks its children by night? Now the waterfall and the land it's on are bequeathed to Lance Evans by his estranged uncle. But when Lance brings his wife and son to explore the inheritance, they scarcely have a chance to marvel at its beauty and settle in to the rustic cabin than good fortune is overshadowed by tragedy. Mists of the past enshroud a dark legacy that threatens to take the lives of those he loves. It'll take all he can do to save them or die trying.