Land of Shadows by Rachel Howzell Hall

LAPD detective Lou Norton is still haunted by the disappearance of her older sister twenty-five years ago. When she's called to a crime scene where teenager Monique Dawson was murdered, she realizes that there is a connection to her sister, namely successful businessman Napoleon Chase and she becomes even more determined to solve the current case. Will problems in her marriage and the memories of her sister derail her plans?  A mystery that's perfect for people who enjoy Michael Connelly's Harry Bosch novels.