Trivia: Almost all of the series' episode titles are either a line from or the title of a Stephen Sondheim song.
Trivia: Although Edie's ex-husband is called "Charles McLain", his name is never mentioned in the episode.
Trivia: In series 1, Richard Roundtree appears as Mr Shaw, who works for the Hafts Detective Agency. "Hafts" is an anagram of "Shaft" who was played by Roundtree in the 1971 film of the same name.
Answer: He was investigating the lead not the case.