Sergeant Jones

In the novel Towards Zero, Detective Sergeant Jones is a police officer who assists Inspector Leach and Superintendent Battle in the investigation into the murder of Lady Camilla Tressilian. Jones' specialty appears to be the collection and matching of fingerprints.

Agatha Christie's Marple
In the 2007 ITV adaptation of the story. Jones is portrayed by Thomas Arnold. Here he also specialises in fingerprints.