A Teacher is murdered at an all girls school. Police investigate and discover that the staff room is full of suspects.
Miss Shepherd says that she was reading a thriller called "Death in Seven Hours". This is the novel on which this film is based.
Detective Inspector Campbell: You take the left row and I'll take the right row.
Sergeant Harvey: "And I'll be in Scotland before..."
When the inspector says "O wad some Power the giftie gie us/ To see oursels as ithers see us! " is Shakespeare, it isn't- it's Robert Burns. Maybe it's meant to be a joke though- given he's a Scot himself, explaining it to an Englishman.
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