There is a legend that if the ravens at the Tower of London ever leave then Britain will fall, so when somebody steals the birds, the Queen calls for Mac B. to find the thief and retrieve them--a mission that takes him to Iceland, where he encounters secret submarines, hungry polar bears, and his arch-nemesis from the KGB.

After being told that his father was an assassin for a criminal organization, fourteen-year-old Alex goes to Italy to find out more and becomes involved in a plan to kill thousands of English school children.

Jonah, Katherine, Chip, and Alex suddenly find themselves in 1483 at the Tower of London, where they discover that Chip and Alex are Prince Edward V and Richard of Shrewsbury, imprisoned by their uncle, King Richard III, but trying to repair history without knowing what is supposed to happen proves challenging. Author's note includes historical facts about the princes and king.

From the Publisher: The Imaginarium Geographica. "What is it?" John asked. The little man blinked and arched an eyebrow. "It is the world, my boy," he said. "All the world, in ink and blood, vellum and parchment, leather and hide . It is the world, and it is yours to save or lose." An unusual murder brings together three strangers, John, Jack, and Charles, on a rainy night in London during the first World War. An eccentric little man called Bert tells...