Structure Part I(1-11) an idle discussion about where Mr. Wainwright has gone and serving to introduce the characters who live in the boarding-house. PartⅡ(l2-33) Mr.Penbury announces that Mr. Wainwright is dead. PartⅡ(34—88) Mr.Penbury direct a general rehearsal of their alibis while waiting for the police. Part IV(89-91) a suspense ending Structure Part I (1—11) Part II (12—33) Part III (34—88) Part IV (89—91) Mr. Penbury direct a general rehearsal of their alibis while waiting for the police. an idle discussion about where Mr. Wainwright has gone and serving to introduce the characters who live in the boarding-house. Mr. Penbury announces that Mr. Wainwright is dead. a suspense ending