I’m still fan boying Gillian Flynn and since I’ve read all she’s published I am reading books she has recommended. I found this link of her recommendations and latched onto the novel The War of the Roses by Warren Adler.
I’m about half way through it. The most noticeable thing so far is how much the style of writing has changed since the 1970s. It’s a bit more formal, a bit more complex, definitely more adult but also more chaste. It was a strange time.
Give it a go.