Long Bright River by Liz Moore

Though Philadelphia police officer Mickey is estranged from her sister Kacey, a heroin addict and sex worker, she tries to keep an eye on her when she patrols the streets. When Kacey goes missing and Mickey's fellow cops dismiss her disappearance, Mickey goes looking for her alone. Long Bright River is equal parts timely thriller, incredibly researched police procedural, and compassionate literary novel about sisterhood, addition, and family secrets that satisfies from start to finish.