MORTAL SINS by Anna Porter (1987)

Journalist Judith Hayes gets an exclusive interview with secretive businessman Paul Zimmerman thanks to her friend Marsha Hillier. For some reason Zimmerman is ready to spill the beans about his private life. Hayes is invited to a special dinner party chez Zimmerman and there, in the company of strangers, bears witness to his unexpected death at the table. What follows is a journey into Zimmerman's obscure past in Hungary.