A blow on the head transports a Yankee to 528 A.D. where he proceeds to modernize King Arthur's kingdom by organizing a school system, constructing telephone lines, and inventing the printing press.

While Morgana sets a horde of werewolves loose to destroy Britain, Merlin and eighteen-year-old Arthur must rally warriors against three overwhelming enemies, without unleashing an even greater evil.

After an all-out battle in Mexico, Jax, Riley, and Evangeline have gone into hiding. There are still rogue Transitioners and evil Kin lords on the hunt for Riley, a descendant of King Arthur, and Evangeline, a powerful wizard with bloodlines to Merlin, in order to gain control over the Eighth Day.

Having moved to Annapolis, Maryland, with her medievalist parents, high school junior Ellie enrolls at Avalon High School where several students may or may not be reincarnations of King Arthur and his court.

When her village is attacked and burned, Gwyna seeks protection from the bard Myrddin, who uses Gwyna in his plan to transform young Arthur into the heroic King Arthur.

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 of Ascolat describes her changing perceptions of war and the people around her as she becomes increasingly involved in the struggle against the invading Saxons and copes with feelings of jealousy toward the beautiful Gwynivere.

"It's the Festival of the Stone, and dinosaurs from across the land will try to pull the great horn Rex-calibur from the magical stone. The one who succeeds shall be crowned king or queen. Arthur-a-tops is probably the least likely to accomplish the task. And yet...could he be the one true king? In this completely reimagined Camelot featuring dino-squires, the trusty Merlin-a-dactyl, and easy-to-trip-over dinosaur tails, O'Hara transforms this classic...

Three children on a holiday in Cornwall find an ancient manuscript which sends them on a dangerous quest for a grail that would reveal the true story of King Arthur.

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.--

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.