Vintage Mystery Extravaganza is hosted by Bev @ My Reader’s Block. Hop on to her site for more details on this challenge.
The list so far:
Rule 11: Van Dine #3: There must be no love interest in the story. To introduce amour is to clutter up a purely intellectual experience with irrelevant sentiment. The business in hand is to bring a criminal to the bar of justice, not to bring a lovelorn couple to the hymeneal altar.
Excellent Intentions by Richard Hull
Rule 1: Van Dine #10: The culprit must turn out to be a person who has played a more or less prominent part in the story — that is, a person with whom the reader is familiar and in whom he takes an interest. For a writer to fasten the crime, in the final chapter, on a stranger or a person who has played a wholly unimportant part in the tale, is to confess to his inability to match wits with the reader.