Nine-year-old Noah Ramsbottom is a lonely boy who lives in a remote farmhouse in England with his Grandad Fred, who is an explorer. But when his beloved grandfather mysteriously disappears, Noah soon embarks on a magical adventure. He travels to Victoria Cave, an enchanted cavern full of magical doors that his grandfather has told him about. While there, Noah meets Mr. Littleplod, the cave guard, who tells Noah that his grandfather has been taken prisoner by the Furglegurgles, vile creatures who smell of old socks. Determined to find the truth, Noah faces exciting and fantastic adventures on his quest through the doors of magical possibility.