As the four friends known as the Grey Griffins begin school at Iron Bridge Academy, where children with special powers like theirs are trained to fight evil beings, rumors surface that a mad scientist known as the Clockwork King is back, and the Griffins must defeat his robotic war machines before total devastation is unleashed upon the world.
When Max Sumner and three friends play a magical card game called Round Table, they realize that it is up to them to prevent the wicked creatures of the cards from destroying their town, indeed, their world.
Sixteen-year-old Colt McAllister, now in training at the secret Central Headquarters Against the Occult and Supernatural academy, joins in the battle against alien forces and discovers startling truths about himself, his friendship with Oz, and why he is being singled out from his fellow recruits.
After his parents are killed in an automobile accident, sixteen-year-old Colt McAllister moves to Arizona where he is recruited by a secret organization to join the battle against malevolent, supernatural creatures from another world.
Tragedy divides the Grey Griffins, but their united quest to capture Von Strife continues, pitting them against killer clockworks, spider-like beasts, and an army of animated dead as they work together to prevent the building of The Paragon Engine.
Eleven-year-old Max Sumner and the Grey Griffins continue to be tested and trained while the Black Wolves, commanded by Max's own father, and Morgan La Fey use the Spear of Ragnarok in their attempt to destroy the world.
Aided by the Knights Templar, the four young Grey Griffins face a host of evil forces, including Morgan LaFey's Black Wolves, who kidnap Max's father while the quartet is spending what at first seemed a fairytale Christmas break at the Sumner's castle in Scotland.