Halloween Homicide

When one of Dr. Sydney Warner's patients is murdered at a haunted house after Sydney encouraged the woman to face her fear of the holiday, she's afraid she'll be suspected of yet another murder.
But Sydney's knowledge of the victim's personal life becomes key to solving the case. The problem is the victim lied about her identity. How can Sydney use her psychology degree to unravel the mind of the victim and determine who wanted her dead if everything Sydney thought she knew about the woman isn't true?