I was going to give this two stars, just for the alien, but to be honest I'm too damned annoyed to even allow it that much, because the premise is delightful, and the execution is absolutely terrible, which makes it an enraging disappointment. My problems with the execution, in list form:
1. This book is ostensibly set in the modern day. It is not at all convincing on that front. People have cellphones, sure, but in true Connie Willis fashion, they're constantly failing to communicate, missing calls, leaving messages, not having signal, etc etc., all signs that Willis knows she needs to include cell phones in her plot because they're a thing people have in the modern world, but also they would ruin her plot, so she can't let anyone actually use them effectively. Also, it's very clear that Willis has no idea how your average 20-45 year old actually uses a cellphone. I have no idea why she didn't just set this book in the 80s or 90s. It would have solved a lot of the problems on this front, and it also would have felt more accurate in terms of the alien conspiracy theories stuff.
2. This book is ostensibly a scifi romcom. I'll give it the scifi, but there's practically no rom and very little com. Like, the romance feels like it was added in under duress or something, because there's no real sense of the two characters connecting or even being attracted to each other. Also, pretty sure this book failed to wring a smile out of me let alone a laugh.
3. Characters so thin that, upon finishing the book, I can't really tell you anything about their personalities or deeper wants and desires. Everyone might as well be a plot device. Even our POV character, Francie, has basically no interiority, she spends the whole book just reacting to things and we have no sense of her wants, her past, her flaws, her anything, really.
4. The inaccuracies! It is very clear that Connie Willis has not been to Vegas, because there were some risible inaccuracies in the part of the book set there. Like cell phones not working on casino floors. Ma'am, what. No. I was just in Vegas a couple months ago, and I assure you, my cellphone worked in all of the casinos I wandered through. Also, there are no bag checks or metal detectors to get into a casino, what the fuck. Modern security in a casino is not like that, it's all the panopticon of endless security cameras and plain clothes security dudes walking around. Willis also has characters say they have no "coverage" multiple times, when what basically any modern American would say instead would be "no signal." The new Star Wars movies are not "reboots." Most cars nowadays don't have keys you stick into the ignition, they're all key fobs and push buttons. There were a bunch of details like that just didn't feel accurate to contemporary America.
5. Predictable plot, apart from the details about the aliens. Francie not catching on about some of these things made her seem frankly dumb. Also, the plot was super repetitive too.
6. That ending??? Like, yes, everything got resolved pretty much, but what the hell is that ending mid-scene, mid-conversation shit? I thought there was something wrong with my ebook.
God, this was just so bad. It's so disappointing, because Willis has written some real masterpieces in books like Passage and The Doomsday Book, and even her more comedic and light stuff like To Say Nothing of the Dog is exponentially better and more charming than this.