I hate the ending of John Grisham's The Partner (unboxed spoilers)

I just finished reading this book and couldn’t wait to see what other people thought of that ending. I was expecting that Stephano or Guy (or both) would somehow get hold of Eva and get the money. Grisham keeps us guessing but I’m glad he spared us the details.
I had to scroll quite a few people who believed Eva betrayed Jack. Thank you for your analysis is - spot on!