A clue is left at a murder scene: a page from a paperback novel. The title of the book is Murder by the Dozen, and local author, T.L. McGinnis, cannot provide any leads. Detectives Josh Riddell and Clint Weller of the Ottawa Police Service are worried about what lies ahead. It soon becomes evident their worst fears have been realized, and a serial killer is using the novel as a guide. It’s impossible to foresee and safeguard all the potential victims, and time is running out. But who is the killer’s real target?