It's 1940, and Britain is on the brink of invasion. Londoner George has been sent to live in the countryside while his brother and guardian, Charlie, trains to be a pilot - but he's very far from safe. An ancient burial ground nearby contains a priceless treasure, a magical Anglo-Saxon crown Hitler is desperate to possess. Alongside Kitty, the granddaughter of a Jewish archaeologist, George must find and protect the crown from the Nazi invaders before it's too late . . .