In "The Gingerbread Man," Lieutenant Jacqueline "Jack" Daniels is on the hunt for a serial killer with a penchant for Christmas cookies. In "Good Cop, Bad Cop," she tracks down a murderer who dismembers his victims. In "The Psychopaths," she faces an entire family of deranged criminals. But now, Jack encounters her most dangerous adversary yet. "The Chemist" is a sociopath who plans to poison Chicago's drinking water. His diabolical scheme aims to take the lives of fifty thousand people, making him the most dangerous terrorist in U.S. history. Will Jack be able to stop him while also deciding whether to accept her boyfriend Latham's surprising marriage proposal? And can she do all this without ruining her reputation and mental health? Join Jack Daniels, her partner Herb Benedict, and her.