The Cousins Book by Karen M. McManus

*The Cousins* by Karen M. McManus is a young adult mystery novel about three estranged cousins—Milly, Aubrey, and Jonah—who are invited to spend the summer at their wealthy grandmother’s private island. The cousins have never met, but they soon learn that their family’s dark secrets are deeply intertwined with their grandmother’s past. As they uncover hidden truths, they realize that their lives are in danger, and they must navigate a web of lies and betrayal to survive. The novel is filled with suspense, twists, and themes of family loyalty and secrets.