
The 39 Clues · Book 9 of 11
Rick Riordan
2010
Amy and Dan are separated while trying to retrieve a clue which is guarded by thousands of soldiers and worry they cannot succeed apart.
AI · Sample
A propulsive thriller that trades depth for forward motion. The voice is direct, the chapters are short, and most readers blow through it in two sittings. If you're between heavier books and want a clean reset, this fits.
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A plot-driven with strong world, tense and immersive read.
11 books · ongoing
Cosine over radar
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