A sudden, unexplained blackout has plunged Stonetown into total darkness, and the Mysterious Benedict Society is right in the middle of the chaos. Reynie, Kate, Sticky, and Constance are safely hidden away in Mr. Benedict's house, but they soon realize that nowhere is truly safe from the evil Mr. Curtain. When a nefarious new plot comes to light, the four gifted friends must unravel a fresh set of clues that threatens to tear them apart from their families, their friends, and even each other. Their desperate search for answers brings them closer to danger than they have ever been before. To stop Mr. Curtain's sinister plans, they must push their unique talents to the absolute limit and face the ultimate test of loyalty. Packed with page-turning action, mind-bending brain teasers, and thrilling escapes, this wildly inventive journey will keep you guessing until the very last puzzle is solved.