About the Book: In a thrilling YA fantasy mystery that merges One of Us Is Lying with Knives Out, the kingdoms of Avendell and Istellia gather at remote Castle Avendell to celebrate a hard-won peace treaty. When King Costis is murdered during a secret meeting with six key suspects—including his prince, his fiancée, and his guard—the group makes a risky pact to keep the death a secret until the treaty is secured. However, a winter storm seals the castle shut, and when the killer begins picking off guests one by one, the original six must desperately work together to expose the magical assassin before one of them is next.