BOAZ WEINSTEIN didn’t know it, but he had just hooked the London Whale.

It was last November, and Mr. Weinstein, a wunderkind of the New York hedge fund world, had spied something strange across the Atlantic. In an obscure corner of the financial markets, prices seemed out of whack. It didn’t make sense.

Mr. Weinstein pounced.

As the financial world now knows, what was out of whack was JPMorgan Chase & Company. One its traders, Bruno Iksil, the man later nicknamed the London Whale for his outsize trades, was about to blow a multibillion-dollar hole in the mighty House of Morgan.

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