"When Celia and Tyrus discover the four lost diaries of Charles Dodgson (a.k.a. Lewis Carroll), they are pulled into Wonderland and must solve riddles and puzzles to stop the Queen of Hearts from opening a door and taking over our world"--
Ten-year-old Flavia and her friends encounter the Roman admiral Pliny before making a journey to her uncle's farm near Mt. Vesuvius, where they try to solve a riddle, reunite a family, and get out of the path of a natural disaster.