Etsuko has fallen in love with a shy, studious lecturer at a university. But she has to tell her parents she's pregnant to force their agreement to her marriage. Their objection is to the rest of her fiance's family: his father was a war criminal; his deceased younger brother, a murderer. His only respectable relative is a research chemist who says he's too sick to come to the wedding. And then the groom is called away on the first night of the honeymoon by an urgent telephone call. His body is found the next morning and State Prosecutor Kirishima must discover who killed him, and why.