Frankly, this episode is the least cohesive and hence enjoyable of the whole series. The elements that aren't, as noted, shamelessly cribbed from the 'Great Gatsby' are strongly reminiscent of plots of 60's comics. In my youth comics such uncanny tales were full of identical murderous twins and sinister funfair magicians but frankly I prefer my entertainment these days to be a tautly plotted detective show with a satisfying denouement. Better still, something pitched in the realms of the possible, if not the probable world.