I may come back and update my rating once I've read the first book, but I was told that this could be read as a standalone without reading The Family Upstairs, so that's what I did. 

This book was pretty good up until the ending when it started wrapping things up. Right when it felt like the action should start ramping up and we should get some satisfying resolutions to the tension that was being built, everything stopped and then everyone got nice, happy endings.

The Rachel and Michael story felt absolutely pointless and once resolved, felt like it contributed nothing to the plot and the rest of the story would have worked fine without it. It had an incredibly unsatisfying resolution. Henry was set up to be an absolute weirdo creep and he was... actually fine and just a good uncle?? Hated it. We spent the whole time building up the Finn situation and then he just turned up? Hated it.

I'm going to read the first book before making my final decision but ultimately, the way the resolution came about compared to the way each POV storyline was set up was very anticlimactic. I'm hoping that if I read the first book and make a connection with these characters, I'll enjoy the HEA they got in this book. But regardless, even if the HEA works, the buildup of the story didn't align with the emotions of the ending.