The House with No Keys

The Deltas are back for their most challenging escape yet in this thrilling sequel to the New York Times bestseller The Mystery of Locked Rooms . Perfect for readers ages 8–12 and grades 3–7 , this fast-paced middle-grade mystery combines high-tech puzzles, friendship, suspense, and an unforgettable escape-room challenge. When a mysterious invitation appears in Sarah's backpack, she, West, and Hannah learn that a brand-new attraction called Mystery Mansion is opening nearby. The owner promises the biggest and best escape house ever—and offers the trio a $10,000 prize if they can escape. The friends accept the challenge hoping to prove their beloved Delta Game is still the best, but once inside, they discover that nothing about Mystery Mansion is quite what it seems. To make it out, they'll need to solve difficult puzzles, face their fears, and protect the friends

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