They bid well; you defend better

Anita Roddick was an English businesswoman best known for being the founder of The Body Shop, which was one of the first cosmetic firms to ban testing on animals. She said, "If you do things well, do them better. Be daring, be first, be different, be just."

In most pursuits, if your opponent plays well, you must play better to succeed. That applies in this deal, where North and South bid well, but East could defeat their contract with excellent defense.

What should East do when his partner leads the diamond king against four hearts?