19 Souls from Amazon:
Private Investigator Jim Bean is a straightforward, to-the-point man. When his latest client, Sophie Evers, asks him to find her brother Daniel, Jim has no idea how complicated his life is about to become.
Daniel is not Sophie’s brother. He is her most coveted prey. Clinging to the belief that they belong together, Sophie kills Daniel’s real sister to manipulate Jim into flushing Daniel out of hiding. She will create the “perfect life” for the only man she’s ever loved, no matter how many people she must kill along the way.
When Jim discovers the truth about Sophie, he’s driven to set things right before her delusional plan claims even more souls.