The case of the three ring puzzle

The urbane Ludovic Travers is engaged on what seems like a fairly routine assignment-investigating for a client the possibility that his aunt was a victim of the wealthy-widows racket. But as might be expected in anything involving the redoubtable Mr. Travers, the pace quickens and the plot thickens. To the original ring of the puzzle are added two others: blackmail and MURDER. The problem is to put the three rings together and come out with a solution, for they all seem completely separate and unrelated. But rest assured. Christopher Bush, that old master of the genuine detective story, solves the whole affair with his usual grand flourish.