Charlotte Halliwell has a secret. Before she has the chance to reveal it to her sister, Audrey, she's found dead. At first glance, it appears to be nothing more than an accident, until poison is found coursing through Charlotte's body. Audrey hires Sloane Monroe, a sassy, headstrong private investigator. As Sloane works to solve the case, a second body is found. With the killer aware that Sloane will stop at nothing to find him, he tracks her every move. Will Sloane uncover the truth before he strikes again?