THE RING O'BELLS MYSTERY
When Roger, Diana and Snubby go to stay at Ring O'Bells village, their old friend Barney hitchhikes over to join them. Barny has nowhere to stay so he decides to sleep in deserted Ring O'Bells Hall. But eerie things happen - bells start to ring and strange noises are heard in deserted passageways. Something very mysterious is going on and the friends mean to find out what...
THE RUBADUB MYSTERY
Who is the enemy agent at a top-secret submarine harbour? Could it be professor James, who pretends to be old and deaf? Or Matthew Marvels the conjuror? And what part does Dunny, the inn porter, play in the mystery?
Roger, Diana, Snubby and Barney are determined to find out all they can. Before long they're caught in another thrilling adventure!