'She was a fool and he knew it and because he loved her it had made no difference'

Kitty Fane is the beautiful but shallow wife of Walter, a bacteriologist stationed in Hong Kong. Unsatisfied by her marriage, she starts an affair with charming, attractive and exciting Charles Townsend. But when Walter discovers her deception, he exacts a strange and terrible vengeance: Kitty must accompany him to his new posting in remote mainland China, where a cholera epidemic rages...