THE POSTMAN ALWAYS RINGS TWICE is almost the same story as Double Indemnity.
Lana Turner runs a roadside diner with her older husband and she wants more. When John Garfield happens by she decides to go for it and the two of them hatch a plan to murder him and collect the insurance money.
It's ending isn't as strong as DOUBLE's but it's interesting to watch the two films to compare and contrast.
This disc I'm recommending also has DIAL M FOR MURDER, THE MALTESE FALCON and THE BIG SLEEP on it. I already own all of these movies but I might just order this myself anyway! The movies are that good.