A remarkable debut novel that takes readers on a journey of discovery, magic, science, and hope. Now in paperback Twelve-year-old Addie should stay away from Maple Lake. After all, her twin brother, Amos, drowned there only a few months ago. But its crisp, clear water runs in Addie's veins, and the notebook Amos left behind -- filled with clues about a mysterious creature that lives in the lake's inky-blue depths -- keeps calling her...