"Cruel Enigma" by Paul Bourget is a fascinating psychological thriller that tells an exceptional story of love and betrayal. In this book, the author successfully combined the elements of a detective story and a social novel, which makes it unique among the literary works of its time. Paul Bourget successfully reproduces the nuances of human psychology, revealing the depths of the main characters' souls and creating a tense atmosphere that keeps the reader in suspense until the last page. "Cruel mystery" is not only an exciting read, but also an opportunity to delve into the world of complex relationships between people and think about unpredictable turns of fate.