The Moonstone (Dover Thrift Editions) by Wilkie Collins
Stolen from the forehead of a Hindu idol, the dazzling gem known as "The Moonstone" resurfaces at a birthday party in an English country home — with an enigmatic trio of watchful Brahmins hot on its trail. Laced with superstitions, suspicion, humor, and romance, this 1868 mystery draws readers into a compelling tale with numerous twists and turns.