Imagine four schoolteachers in a romantic thriller. At her twin brother's funeral, Lily touches his casket, whispering a Scottish blood oath: "If your killers were from the Diabhal, then they should know that I'll be a Deamhan and will pursue them until your soul is avenged." A middle school science teacher, Lily involves three teacher colleagues to help her avenge the murder. They risk all in their pursuit, hitting dead ends while confronting the police, the FBI, local mobsters, and even the CIA. Their illusive target is Zakov, a legendary assassin for the Russian Mafiya who has more than 200 kills. They accept help from unsavory characters, seeking anyone to take on Zakov. Can Lily find justice? Will a new love help or hinder her quest? Can the teachers write a lesson plan to overcome the ruthless killer? Will Lily find intimacy and redemption on her journey?