For his thirteenth birthday, Freddie receives an unusual gift from his Uncle Patrick — an ancient world map. It looks like a curiosity, something to hang on a wall. But it's far more than that.Within days, Freddie and his best friend Connor are flung far from home and everything they know, onto the frozen slopes of Everest, chasing a long-buried mystery - pursued by ruthless adversaries who will stop at nothing to get there first.