The Decagon House Murders by Yukito Ayatsuji
In a secluded island, seven university students gather at the Decagon House to spend their summer vacation. However, their peaceful retreat quickly turns into a nightmare when one of them is found dead, mimicking a murder described in a mystery novel. As more bodies appear, the remaining students must unravel the secrets of the Decagon House and uncover the identity of the killer before they become the next victims. With a thrilling blend of suspense and intricate puzzles, this book keeps readers on the edge of their seats until the shocking truth is revealed.