The Speaker of Mandarin - 1983

Chief inspector Wexford had always dreamt of visiting China, and was sure he never would. But for once he was wrong. He, a country policeman, had walked on the Great Wall, set foot on the Stone Boat in the Summer Palace, touched the columns on the Temple of Heaven . . .
But there were some things about his trip to China that Wexford could never have dreamt of. That an old woman with bound feet would haunt him from one city to the next. That a man would be tragically drowned. Or that, back in England, he would find himself investigating the murder of one of his fellow tourists . . . and locked in a mystery that always led back to the East.

An Unkindness of Ravens - 1985

Rodney Williams's disappearance seems typical to Chief Inspector Wexford -- a simple case of a man running off with a woman other than his wife. But when another woman reports that her husband is missing, the case turns unpleasantly complex. And there is a group: the Ravens