The Vanishing Point by Frances Needham

Five friends set out for a rugged hike along the Mason-Dixon Trail, seeking an escape from the grind of daily life. But the wilderness of Whiskey Springs is not what it seems. As the familiar world slips away, the group is stalked by an indifferent silence and a reality that refuses to hold its shape. One by one, the trail claims its toll, leaving James to navigate a waking nightmare where the line between the woods and his own mind vanishes. Some things aren't lost—they are simply rewritten.