In the novel A Caribbean Mystery, Gregory “Greg” Dyson is a nature lover. He especially likes butterflies and birds. Lucky is his second wife. His first wife died.
Greg is an American, and is described as being a big man with an "upstanding bush of thick grey hair". He is boisterous and happy-looking.
Greg's work involves writing about butterflies.
Portrayals
In the 1983 Warner Bros adaptation, Greg Dyson is portrayed by Stephen Macht. Here he takes serenite for high blood pressure, just as in the original novel.
In the BBC 1989 adaptation, Greg Dyson is portrayed by Robert Swann.
In the 2013 ITV adaptation, Greg Dyson is portrayed by Charles Mesure. Here he is a wildlife photographer who is working together with Edward Hillingdon who is an ornithologist. Greg does not have a previous wife in this adaptation. Instead, Lucky Dyson had a previous husband, one Parker De Wit III. After he died (under suspicious circumstances), Greg married Lucky. By the time of the events at St. Honoré, Greg already knew that Lucky was no longer in love with him. However, Lucky reminded him that they cannot get divorced because they knew too much about each other and could not trust each other once apart. Greg knew about Lucky poisoning her first husband. And Lucky reminded him that as the second husband, Greg would be considered a suspect or accomplice. Unlike some other portrayals, Greg is here portrayed as somewhat of a lady's man. He claims, for example, that he used to romance Molly Kendal years ago when she was unmarried and at the hotel at that time run by her parents.