The Murder at the Vicarage
In addition to Miss Marple, there are two semi-regular characters in the series. The first is Inspector (later Superintendent) Slack, played by David Horovitch; the second is Constable (later Sergeant) Lake, played by Ian Brimble. Slack and Lake appear in five episodes: "The Body in the Library", "The Murder at the Vicarage", "4.50 From Paddington", "They Do It with Mirrors" and "The Mirror Crack'd from Side to Side". They are the official detectives and both (particularly Slack) originally dislike and are exasperated by Miss Marple, her interference and her methods, but they eventually come to respect (and indeed, in the case of Lake, like) her.