On a sunny September morning, the creatures first appear. Shur sees one of them hovering outside the window in history class: it looks like a giant butterfly, at first too beautiful and strange to seem like a threat. But when emergency alerts light up everyone's phones around her, she realizes something very, very wrong is happening outside. These... things are everywhere. By the time Shur makes it back to her house with her brother, Keene, and their two best friends, it's clear they must face whatever comes next on their own. A terrifying species the world's never seen before has suddenly emerged, and few living things are safe. As the creatures swarm and attack outside, life for Shur and her friends becomes a survival game. They board the windows, stockpile supplies, and try to make sense of the news reports for as long as the power stays on. Yet nothing can prepare them for what follows. The butterflies are only the beginning. The next onslaught will be deadlier, and even closer to home.

How can such a small New England island have so many secrets, and harbor so much evil? Gracie Hutchinson is about to find out! 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 localshave taken the ferry to the mainland, Gracie must stay behind. But she's intruiged to find someone her age has stayed too - Joseph Wescott, whose mysterious family lives in WEstcott 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 Westcot 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 beneathn the snow.