Join Quentin and his friends in an exhilarating summer adventure that blends mystery, magic, and espionage! When Captain Unwin Macpherson uncovers a rogue terrorist cell known as ION, he enlists the help of young spies to investigate. Their journey takes them to the enchanting Loch of Arthur, where they stumble upon ancient secrets and hidden tunnels.

As they explore the loch, Quentin discovers a diary belonging to a long-lost ancestor, revealing the legendary Moon Code and the connection to King Arthur's treasures. But their fun takes a dangerous turn when they encounter armed men linked to ION, leading to a thrilling escape and a race against time to thwart a sinister plot.

With the fate of the realm hanging in the balance, Quentin must rally his friends, decode the mysteries of the past, and embrace his destiny as a new-age knight. Will they uncover the truth before it's too late? Dive into this action-packed tale of friendship, bravery, and the magic of legends!