All fourteen-year-old gamer girl Sophie Sawyer wants to do is defeat Morgan Le Fay in her favorite Arthurian videogame. She has no idea the secret code sent via text message is actually a magical spell that will send her back in time to meet up with a real life King Arthur instead.

Of course Arthur's not king yet—he hasn't pulled the sword from the stone—and he has no idea of his illustrious destiny. And when a twist of fate sends him forward in time—to modern day high school—history is suddenly in jeopardy. Even more so when Arthur Googles himself and realizes what lies in store for him if he returns to his own time—and decides he'd rather try out for the football team instead.

Now Sophie and her best friend Stuart find themselves in a race against time—forced to use their 21st century wits to keep history on track, battle a real-life version of their favorite videogame villain, and get the once and future king back where he belongs. Or the world, as they know it, may no longer exist.