Regression. The Sharon Hayes Detective Series, #2

Homicide Detective Sharon Hayes is back, but she has quit the NYPD and has hung out her own shingle. Her first case: her own. She has questions, lots of questions about what happened to her, her parents, her boss (and godfather), and her now dead relationship with Jimmy James, the forensics wunderkind. She decides to seek professional help and finds a psychiatrist who specializes in regression, using hypnotherapy.
Sharon is convinced the answers she seeks are buried deep within her own brain...along with a thirty-something British woman who has been with her for as long as she can remember. The woman in her head used to be quiet, but since Sharon launched a career in crime-solving, she has become pushy and even verbally abusive. Sharon does not want Dr. Ronald Black to find her secret companion. She doesn't know that he found her in their first session and is grooming her to partner with him in publishing a major study that will catapult him into fame...and fortune.
Sharon has to find her own cases at this point: she doesn't have much of a budget for advertising at this point in her solo career. She finds a trend she feels merits investigating: the murders, seeming unrelated, of several young women in the suburban area north of the Bronx, her stomping grounds. As she develops her case and is closing in on a suspect, she becomes entangled with dangerously sick and depraved criminals who wouldn't think twice about eliminating her...and she walks perilously close to their traps, unaware that her introduction to Dr.
Black is a move which pulls her further into danger. She gets tough advice from the voice in her head. Will she take it and save both of them?