The Wife Between Us by Greer Hendricks & Sarah Pekkanen was a book I rated highly last year (4.5 stars which is rare for me). It was delightfully twisty and offered up some complex (and not always likeable) characters.
I can’t quite fathom how two authors can co-write a novel. Indeed, my childhood bestie and I attempted that very thing when we were 8 or 9 years old and it didn’t end well. (I ripped up the book and threw it away. Thankfully she resurrected it from our rubbish bin and stuck it back together and it became a gift we ‘gave’ each other every few years. And I’m fairly certain she must still have it as I last gifted it to her in the 1990s sometime!)
Anyhoo… Hendricks and Pekkanen seem to make it work.