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.

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.