Faerie Tale by Raymond E. Feist

In this dark fantasy novel, a family moves to a rural estate in upstate New York, only to discover that the land is steeped in ancient magic and inhabited by sinister faerie creatures. As the family, particularly the twin boys, becomes entangled in the otherworldly happenings, they uncover a hidden realm where the boundaries between reality and myth blur. The story weaves together elements of folklore and suspense as the family confronts the malevolent forces threatening their lives, ultimately exploring themes of belief, fear, and the power of ancient legends.