In the sleepy coastal town of New Castle, New Hampshire, seventeen-year-old Billy Hasler's life is about to take a terrifying turn. When his best friend David Spivey inherits a mysterious house on a nearby island, it seems like the perfect place to spend their final summer before heading off to college. No parents. No police. No responsibilities.

As they dig into the island's dark past, they awaken an ancient evil that has influenced generations. What begins as an innocent summer adventure quickly descends into a nightmare.

"Something I Keep Upstairs" is a haunting exploration of friendship, sacrifice, and the darkness lurking just beyond our understanding.

J.D. Barker is the New York Times and international best-selling author of numerous novels, including SOMETHING I KEEP UPSTAIRS and the wildly popular 4MK thriller series. He regularly collaborates with James Patterson. His books have been translated into two dozen languages, sold in more than 150 countries, and optioned for both film and television. Barker resides in coastal New Hampshire with his wife, Dayna, and their daughter, Ember.