Fractured Lines by Jen McLaughlin is book 4 in the Out of Line series. I haven’t read any of the books from this series before. You can read this book as a stand-alone from the series. There is some recapping as to what goes on in the other books so you’re not completely lost, but if you are wanting to read this series I would definitely start by reading book 1 Out of Line. For those who have read this series will probably really love Fractured Lines because their favorite characters are back. I’m not sure if they will be happy seeing their favorite characters go through more drama.