In the wake of the battle to stop Wolfe, the Powers division gathers to mourn the loss of their fellow officers, while Walker seeks answers about his own future and the possibility of becoming Diamond once again. After seeing the uncertain and dangerous side effects of Sway first-hand Johnny Royalle begins unsavory experiments on known subjects of the drug.

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.

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.

The origins of SuperShock’s complicated and mysterious relationship with Retro Girl are revealed, as Calista, Sgt. Martinez and Zora team up to fill the Powers void left in her absence. The disgraced Senator Brown’s body is discovered, catapulting newly reinstated detectives, Walker and Pilgrim into the investigation.