The Continental Op is called to Personville (known as "Poisonville" to the locals) by the newspaper publisher Donald Willsson, who is murdered before the Op has a chance to meet with him. The Op begins to investigate Willsson's murder and meets with Willsson's father, Elihu Willsson, a local industrialist who has found his control of the city threatened by several competing gangs. Elihu had originally invited those gangs into Personville to help him impose and then enforce the end of a labor dispute.