Believe the cards of your opponents

John Buchan, 1st Baron Tweedsmuir, a Scottish novelist, historian and politician who served as Governor General of Canada, said, "Every man at the bottom of his heart believes that he is a born detective."

A bridge player needs to be a detective. There are clues littered around every deal, just waiting to be interpreted correctly.

In today's deal, first there is a bidding question. North opens one club, East overcalls one heart, South responds one spade, and North raises to two spades. What should South do now?