Long Bright River by Liz Moore

I loved God Of The Woods so knew I'd enjoy this. I love crime that is character based. Mickey and Kacey will stay with me. I was hooked from the first line.

From the back

Once inseparable, sisters Mickey and Kacey are on different paths, but they walk the same streets. Mickey on her police beat and Kacey in the shadows of the city's darkest corners where the drug addicts and sex workers preside. When a string of murders coincides with Kacey's disappearance, Mickey is terrified her sister could be next.

But in a community where death and murder is rife, will Mickey be able to save her sister before it's too late?