Gracie Hutchinson has lived here her whole life and knows there's some truth to those words. Every few years someone dies in a snowstorm, or loses their mind, or disappears without a trace. Sometimes it seems like more than just New England weather. Now, a hundred-year-storm is approaching, and while most of the locals have taken the ferry to the mainland, Gracie must stay behind.

But she's intrigued to find someone else her age has stayed too--Joseph Wescott, whose mysterious family lives in Wescott Manor, descendants of the legendary first settlers of Fall Island. Together, they stumble across something even more unsettling than the coming storm: the body of a stranger, murdered in a grim ritual. Someone on the island believes the old Fall superstitions have a dark power--and now, they have Gracie in their sights.

As the hours count down to the blizzard's landfall, it seems the only safe place to go is Westcott Manor. But Gracie wonders if there's another reason why she's been brought there, one that has to do with Joseph. She'll discover secrets that have been kept for generations, a hidden history, and the terrifying truth about Fall Island. Because even when the storm ends, there's no escape from the horror beneath the snow.