Brief Summary by Robert Houghton: A visit from pompous Great-uncle Robert, a travelling fair, the intriguing story of the Green Hands Gang and mysterious thefts in the night all combine to make a second wonderful mystery for Roger, Diana, Snubby and Barney the circus boy. How on earth does a thief manage to get through locked doors and windows with bars to steal valuable papers? The four children, along with Loony the dog and Miranda the monkey are determined to find out.
