In the novel The Moving Finger, Inspector Graves comes down from London to Lymstock to help in investigating the anonymous letters being received in the village. He is an expert on anonymous letter cases and had helped Superintendent Nash two years earlier on another case.
Graves was described as a "tall lantern-jawed man in plain clothes" and had a deep lugubrious voice like a "depressed bloodhound".
In the ITV 2006 adaptation of the novel (Episode 2, Series of Agatha Christie's Marple), Graves is played by Keith Allen. He takes on the lead role in the investigation as Superintendent Nash is not featured in the show.