I had been given an advanced copy of this book but for whatever reason, kept putting it off. I don’t know why, as it is fantastic!!!! I want to start by saying that I think there’s a huge difference between a thriller and a mystery and this is a great detective style mystery. It is NOT a light, trashy thriller – it actually took me a very long time to read! It’s really well written and definitely kept me on my toes the whole time. It’s set in a Philly neighborhood and is the story of two sisters. Mickey is a cop, and her sister Kacey is a drug addict, living on the streets. The two sisters (once inseparable best friends) no longer speak but Mickey always keeps an eye out for her sister. One day, Kacey goes missing, right in the middle of a string of murders where all of the victims are drug addicted women, living on the streets. Mickey becomes (rightly so!) obsessed with finding her sister (and the killer), putting her whole career on the line to do so (her colleagues don’t know her backtory or anything about her sister). The plot alternates between modern day and the girls’ childhood. There’s a huge twist that I didn’t see coming, but I really loved it. This book is a double whammy as it’s incredibly heartwarming but also very anxiety inducing (in a good way!). I couldn’t put it down and have been telling all of my mystery loving friends to pick it up!!!