Overall it was good, although I was really uninvested for about 20 minutes after the first reveal.
I found Harlan's plan to maintain Marta's innocence all sorts of convoluted insanity.
At first, it was interesting to have a mystery writer telling someone how to cover up a "murder," but the plan involves like 6 steps (one of which is climbing to the third floor on an exterior trellis), and she's just a nurse. If she gets one thing wrong, it's gonna raise some serious suspicions with detectives, and given how famous he is, I don't think they will be average-intelligence detectives. He also doesn't consider the whole toxicology angle. With a suicide that comes out of nowhere, the family will definitely want a report done, and that's gonna reveal the morphine. Harlan's plan also involves Marta hiding the truth from detectives, but Harlan also should know how detectives work. Marta can omit truth all she wants, but if they ask her one point blank question, she'll have to lie. Which would be fine if she didn't admit the puking/lying connection, but she does. Just say it's a ridiculous idea and that you're feeling ill that day, done.
It seems like he could have done any number of other things, like maybe write a suicide note explaining that he overdosed himself while Marta was downstairs talking to someone, or something to that effect. But then I guess there wouldn't be a movie.
