6 Los Angeles cops, originally sent deep underground to bust an extremely violent international criminal network, and thought to be dead for the past couple of years, are still alive and turned rogue, calling themselves the Vikings. LAPD Sgt. Shane Scully is back in action!

A nightmarish series of events sweeps LAPD's Sergeant Shane Scully and his wife (and boss), Alexa, into the vortex of an enormous, jurisdictional firestorm. First, a sheriff's deputy, a friend of Shane's, is gunned down while serving a routine search warrant. His fellow deputies blame the incident on the Bureau of Alcohol, Tobacco and Firearms, whom they angrily accuse of having failed to warn them that the suspect had a huge arsenal of illegal weapons...

Detective Shane Scully responds to a call in the Hollywood hills at a once-immaculate mansion, the scene of an infamous murder twenty-five years prior. He discovers the remnants of a lavish pool party. The revelers have fled, leaving three dead bodies in their wake, all shot with the same gun. One is an acclaimed film producer. The other two, a pair of gorgeous women.