Appointment with Death (1988 film)
In the 1988 film adaption of Appointment with Death, Lennox Boynton is portrayed by Nicholas Guest. In this adaptation, his circumstances are the same as in the original and the portrayal is fairly faithful in a few parts but where in the novel he is often morose and withdrawn, here he is slightly more engaged and upbeat, especially when his wife is not with Jefferson Cope. During the trip through Europe, he is often the one handling the camera, and taking snaps of Ginevra who likes her photo taken at the various sights. Later, on the ship from Trieste to Jaffa, Lennox actually has the energy to punch Jefferson Cope in the face when he discovers a cigarette case which he gave to Nadine. This fracas inadvertently saved Jefferson from an attempt by Mrs Boynton to poison him.
Appointment with Death (2008)
In the 2008 ITV adaption of Appointment with Death, Lennox is renamed Leonard and has a totally different backstory. Here he is unmarried and the son of Lord Boynton, the current husband of Lady Boynton. Leonard is therefore her stepson and like the other children of her family (who were all adopted), he detested her. He refuses to refer to her as "mother" or even "stepmother" as his father requested but insisted calling her "Lady Boynton". In this adaptation he does not live with Lady Boynton or the other children, who appear to stay in New York. Leonard stays in England and manages his father's house in Dorset while his father travels the Middle-east on various archaeological expeditions. Like Lord Boynton himself, Leonard is also a plausible suspect in the murder of Lady Boynton because he had remained behind working on the dig and did not go out for an excursion with the rest of the tour.
Leonard plays a major role in a sideplot. Towards the end of the show, a skull is found at Ain Musa and Lord Boynton actually believes it is the skull of John the Baptist which he had been searching for all his life. However, earlier on, Poirot had seen Leonard purchasing a bag from an Arab. Poirot found the bag hidden among some digging tools. Inside was a tooth with a gold filling. During the denouement, Poirot gives the tooth to Lord Boynton. The tooth fits the skull perfectly, showing that it is of recent origin. It turns out that the skull was planted by Leonard. He explains that all Lord Boynton had spent all his life "traipsing about the Middle East" conducting dig after dig but "time after time finding absolutely nothing of significance." Leonard said he wanted this to end and so he had planted the skull free his father "of this need". This ruse, although exposed, seems to have worked, as, at the end of the show, Lord Boynton declares that he is "cured of archaeology".