The debut title in a new middle-grade series featuring unseen realms, Norse mythology, and a pair of unlikely heroes in a race to prevent a war among Viking gods–Ragnarok!–that could lead to the end of the world. “What is the unbelievable FIB?” That’s the question eleven-year-old Prudence Potts discovers on a baffling card no one else in Middleton–except ABE, a new kid with a knack for solving riddles--seems to see. When a mysterious man named Mister Fox identifies himself as the card’s sender and asks for ABE and Pru’s help investigating mythical beings infiltrating the town, that’s at least one thing Pru finds hard to believe.

Soon Pru and ABE discover another world beneath their quiet town, where Viking gods lurk just out of sight. But when the pair finds themselves locked in a battle against a dangerously clever enemy, they must race to secure the Eye of Odin, source of all knowledge–and the key to stopping a war that could destroy both human and immortal realms.

Author Adam Shaughnessy draws from classic lore to create a new world where uncertainty opens the door to magic and the last thing you should do is believe your own eyes. Fans of Rick Riordan and Diana Wynne Jones will delight in the charming characters, abundant puzzles and plot twists, and sly humor of this first novel in a new series.