The gags are there and the characters likeable. The big plot reveal upon which the title is based happens far too early though, leaving a plodding twenty pages where the inevitable liasons come together without much in the way of passion. Wodehouse seems to have written the book in a single draft, too - the most engaging character is initially portrayed as a money-sucking scoundrel but brings about a very smart resolution worthy of Jeeves, before Wodehouse remembers that he's meant to be the villian of the piece and returns him to roguery.
It's still not a bad book. It's a short amusing pastoral jape much like any other Wodehouse novel. But there's nothing to distinguish it, no Empress of Blandings or Psmith to elevate it. Do read it if you have a lazy few hours, but otherwise pick up something with Bertie Wooster in....Continua