In late twelfth-century England, a thirteen-year-old boy named Arthur recounts how Merlin gives him a magical seeing stone which shows him images of the legendary King Arthur, the events of whose life seem to have many parallels to his own.

In fifth-century Britain, nine years after the destruction of their home on the island of Shalott brings her to live with her father and brothers in the military encampments of Arthur's army, seventeen-year-old Elaine describes her changing perceptions of war and the people around her as she becomes increasingly involved in the bitter struggle against the invading Saxons.

When thirteen-year-old Arthur of Gal, the future King Arthur, accidentally time-travels to the twenty-first century, Sophie Sawyer, twelve, must convince him to return and correct the time line.

At the flea market nine-and-a-half-year-old Chase and his younger sister Ava acquire an old suitcase filled with rows of carefully packed strange objects, and when they handle one of the objects (a dragon-headed doorknob) they find themselves in King Arthur's castle, on a mission to save the King--and pursued by a strange man whom they first saw at the flea market, who is after their suitcase.--