The Unbreakable Code

Emily and James continue their book-scavenging adventures in San Francisco when they encounter a new mystery involving the death of a famous spy and map maker. A peculiar book points them toward a World War II-era military cipher that has never been broken. The young sleuths race against a rival team to solve the encrypted message while navigating through San Francisco's historic military sites and coastal landmarks. Their investigation intersects with Emily's personal life as she deals with changes at home and growing uncertainty about her friendships. The mystery explores themes of loyalty, the impact of war across generations, and the challenge of maintaining relationships during times of change. At its core, the story examines how codes - both literal and metaphorical - shape human connections and trust.

Readers found this second Book Scavenger installment engaging but not as strong as the first book. Many noted it maintains the puzzle-solving fun while adding deeper character development for Emily and James. Liked: - Complex codes and ciphers that readers can solve alongside characters - San Francisco setting details and historical elements - Good balance of mystery and friendship themes - Works as standalone despite being a sequel Disliked: - Slower pacing in middle sections - Less exciting than first book - Some puzzle solutions feel rushed - Secondary characters need more development Ratings: Goodreads: 4.14/5 (2,900+ ratings) Amazon: 4.7/5 (115 ratings) Notable reader comments: "The codes are challenging enough to be fun but not impossible to solve" -Goodreads reviewer "Takes longer to get going than Book 1 but still delivers on the mystery" -Amazon review "Perfect for kids who like puzzle books and solving riddles" -School Library Journal reader review

The Westing Game by Ellen Raskin A group of young puzzle-solvers compete to inherit a fortune by decoding clues left in the will of a mysterious millionaire.

Chasing Vermeer by Blue Balliett Two sixth-graders use codes, patterns, and mathematical principles to solve an art theft mystery in Chicago.

Book Scavenger by Jennifer Chambliss Bertman A twelve-year-old girl joins an online game where participants hide books and solve puzzles to find other books across San Francisco.

Mr. Lemoncello's Library by Chris Grabenstein Students must solve riddles and literary puzzles to escape from a high-tech library created by an eccentric game designer.

The London Eye Mystery by Siobhan Dowd A boy uses logic, deduction, and mathematical thinking to find his missing cousin who disappeared from a pod on the London Eye.

🔍 Author Jennifer Chambliss Bertman was inspired to write this series after participating in real-life book treasure hunts in San Francisco. 📚 The book is part of the "Book Scavenger" series, which follows young code-crackers who solve literary puzzles in a game that spans across the United States. 🗝️ The cryptography featured in the story includes actual historical codes, including the Pigpen cipher and other techniques used by Benjamin Franklin. 🌉 The story is set in San Francisco and incorporates real locations throughout the city, allowing readers to follow along with a map. 📖 The author created a real-world version of the Book Scavenger game featured in the series, where readers can participate in literary treasure hunts through a companion website.