Detective Sergeant Lake

In the novel They do it with Mirrors, Detective Sergeant Lake assists Curry in the investigation at Stonygates. When BBC adapted the Agatha Christie novels for their Miss Marple, Lake became a recurrent character who usually appears alongside Inspector Slack.

Portrayals
In Murder with Mirrors (1985), Sergeant Lake is played by Christopher Fairbank.

In the BBC "Miss Marple" series Lake became a recurrent character starting from the first episode. Throughout, he is played by Ian Brimble.
 * The Body in the Library
 * The Murder at the Vicarage - in this second appearance, Lake has been promoted to Sergeant.
 * 4.50 from Paddington
 * They do it with Mirrors - by this time, Miss Marple already knows Lake quite well and asks about his family and especially his children.
 * The Mirror Crack'd from Side to Side.

In the ITV 2009 adaptation of the novel as part of their Agatha Christie's Marple series, Sergeant Lake is played by Sean Hughes. He is tasked with running from the spot where Johnnie Restarick was standing on the night of the murder, to the house, while Inspector Curry times him. This is to see how long it would have taken Johnnie to run to the house, murder Christian Gulbrandsen, and then make his appearance in the drawing room of Stonygates. In the book, it is Police Constable Dodgett who does the running.