Although he wants to take his Cub Scouts to Wales, Heron Melomane (a.k.a. Colonel Clifton) is forced to take them to Devonshire. The reason for this change of plan: a note in his letterbox stating that the Second World War isn't finished yet and signed AKC 666! Decrypted by his faithful housekeeper, Miss Partridge, the message sets up a mysterious meeting... This information piques the interest of the British Secret Service, and it's of course Clifton who is chosen to sort out this mess. But Clifton is unaware that MI5 sent a new agent to protect him. Just in case...