Bad Mother by Mia Sheridan

From bestselling author Mia Sheridan comes the twisted story of one detective’s pursuit of a serial killer who’s taunting her…and the familiar connection between them that’s haunting her.

When Sienna Walker is nearly fired from the NYPD, the last thing she expects is a second chance in the one place she vowed never to return to. But she can’t afford to turn down the job offer, even if a painful familial past and a broken engagement hardly make Reno, Nevada, home sweet home.
It’s made even less sweet by Sienna’s first case—a serial killer with a curious fixation on her. Along with his victims, the killer leaves perplexing clues and chilling journal entries addressed to Sienna detailing the murders he claims his mother committed. The case continues to get personal when her ex-fiancé is called out by the killer as well. Whoever’s behind the diabolical murders, Sienna can only be sure of one thing…it’s someone close to home.

As the twisted truth forces Sienna to face her complicated feelings, she learns that no matter how far you run from your past, it always catches up to you in the end.