Ronald Marsh

In the novel Lord Edgware Dies, Captain Ronald Marsh (later 5th Baron Edgware) is Lord Edgware's nephew and heir to his title. He was initially suffering from money troubles, until his uncle's death. He had gone to Eton and Harrow with someone named Spencer Jones.

He is a dark young man, with a round vacuous face, and a small black moustache. Hastings describes his moustache as being "marooned like an island in the middle of the expanse of face".

Captain Marsh had lived in Lord Edgware's house until three years prior to the events of the novel. He had quarrelled with his uncle, and Lord Edgware forbade him the house.