Four cities, four killers, four murders. The Alliance is just getting started.

When four unconnected serial killers simultaneously commit identical murders across four different US cities, FBI Special Agent Shannon Wallace faces an unprecedented threat-a cooperative of killers working in unison. Each homicide is witnessed by a survivor, and now these lucky ones need to decide how to tell their stories to the world.

Their posts about the horrific murders create a media storm and a new term is soon coined for the killers: The Alliance. As they recruit new killers into their ranks and more innocent people linked to the initial murders are killed it becomes clear that Wallace is dealing with an unprecedented threat-a deadly alliance formed to terrorize the nation with coordinated strikes.

With the killers always one step ahead, the very fabric of society threatens to unravel and Wallace battles to decipher The Alliance's endgame before they dismantle civilization city by city. In a desperate race against time, can Wallace uncover the members and motives of the Alliance and end their reign of terror before more victims wind up dead.