2. The Postman Always Rings Twice

Number 2, 11 April quiz: here is an extract from the Wikipedia page on the crime novel by James Cain:

The story is narrated in the first person by Frank, a young drifter who stops at a rural California diner for a meal, and ends up working there. The diner is operated by a young, beautiful woman, Cora, and her much older husband, Nick Papadakis, sometimes called "The Greek".

There is an immediate attraction between Frank and Cora, and they begin a passionate affair.

Cora, a femme fatale figure, is tired of her situation, married to a man she does not love, and working at a diner that she wishes to own and improve. She and Frank scheme to murder Nick in order to start a new life together without her losing the diner.