The world is turned upside down by the seemingly impossible and horrifying murder of retro girl. Pressure is on the powers division to bring the perpetrator to Justice, but when Walker is pulled off the case for being too close to the victim, and may be a suspect himself, he must go off-the-books to avenge the woman he loved.

On the day of Retro Girl's funeral, Detectives Walker and Pilgrim prepare to combat violence between rival gangs The Quantums and The Hacks. Hoping to fill her place, Calista makes her public debut as New Retro Girl. Still reeling from Retro Girl's death, and with her murder officially closed, Walker doggedly pursues a suspect he believes to be the real murderer.

Commander Cross unofficially reopens the Retro girl case, ordering Pilgrim and Walker to lead a covert investigation that may put them in a life-threatening situation. Meanwhile, Los Angeles goes in lockdown mode as gang warfare reaches a fever pitch, pulling the revered Power, SuperShock out of retirement.

In the aftermath of a catastrophic political scandal, Walker and Pilgrim investigate a high-priority suspect and uncover shocking government connections. Meanwhile Triphammer is determined to create a new Powers team, recruiting Zora and a new protégé, Sgt. Tiberio Martinez.