Owen Brown, a fourth grader, watches his best friend Dana disappear through the floor of the school, and he sets out with Jon and Sydney to find her.

Hoping to stop the war about to be waged in Pinewood Bluffs, Owen, Dana, Jon, and Sydney stow away in Loki's sledge, but when they emerge in the Babylonian Underworld full of monsters and the terrible Scorpion King, they face more than they ever expected.

When brothers Simon, Henry, and Jack move with their parents to Arizona, they are irresistably drawn to explore the aptly named Superstition Mountain, in spite of warnings that it is not safe.

Pinewood Bluffs is under attack and Dana's parents are missing, Owen, Dana, Jon, and Sydney must find a powerful Crystal Rune before Loki can get to it.

A young thief is drawn into a life of magic and adventure after picking the pocket of the powerful wizard Nevery Flinglas, who has returned from exile to attempt to reverse the troubling decline of magic in Wellmet City.