City of Bones by Blake Pierce

In the rough streets of 1920s New York City, 34 year-old Ava Gold, a widower and single mom, claws her way up to become the first female homicide detective in her NYPD precinct. She is as tough as they come, and willing to hold her own in a man’s world.

When Ava is called in to investigate the murder of a young woman beneath the Brooklyn Bridge, she quickly realizes this is no typical murder—and that she is up against no typical serial killer. To find him, her search will lead her into the rough streets and docks of burgeoning Brooklyn.

But Ava, facing resentment and opposition from her all-male police force, has been transferred to a downtown precinct, and hazed relentlessly in the hope that she will become miserable enough to drop out. Ava, pushed to the edge, will have to rely on her brilliant intellect to enter the killer’s mind, to prove herself, and to stop him before he strikes again.