I feel wrong giving this a rating, because I DNF'd it at 50%. However, I have to leave a review and say that the writing is nearly unbearable and the characters are so strange and unlifelike it's difficult to read.
Susannah Falkner is a woman on the run, who rescues damsels in distress as a side hustle (because she's a lesbian). She claims to be a self-sufficient B-A who can accomplish any task set before her. She claims she is professional, ruthless, and overall an excellent addition to her mafia boss uncle's... gang? Network? Not entirely sure, but according to the examples we're shown, none of it is true.
For example, on her first mission, Susannah's client (a young woman trapped in an abusive engagement) is shot and killed on her way to safety. In response to this tragedy, Susannah clutches her dying body and screams and cries while the police try to pry her away. She kicks and punches them, trying to stay near the body (of this woman she has only met today??). This results in her receiving accounts of resisting law enforcement as well as other charges. She is bailed out by the fiancee of her client, because he is under the impression that she will bring justice to whoever killed the woman (for whatever reason). Susannah is then flown out of Arizona by her mafia boss uncle in a private jet.
There are many weird instances like this, where Susannah acts like an inexperienced teenage girl as opposed to a professional assassin. She also seems to be LGBTQ+ just for the sake of Swann getting to claim he "has a lesbian main character!!" She flirts with every woman she sees (who always seem to return her affection). She calls an FBI agent on business and suddenly gets overwhelmed with desire on the phone and asks her out on a date?? Genuinely, the events that occur are so disjointed and unnatural it feels like reading an outline.
Overall, cannot determine why this book has so many good reviews, it was just an overall bad piece of literature (if you can even call it that).