San Diego, Calif., newswoman Casey Cheng, the heroine of this riveting thriller from Brackmann (Go-Between), researches an article exploring the effects of a mass shooting, perpetrated by Alan Chastain, on his victims. She was one of them, shot in the back. Once she recovers from her wounds, Casey interviews Alan's mother, who allows her to inspect Alan's bedroom. She finds a graphic novel there that leads her to Lucas Derry, who later attempts to assassinate Matt Cason, a local Congressman up for reelection. When a photo taken at the scene of the shooting showing Matt's campaign worker Sarah Price attempting to save a collateral victim later goes viral, Sarah is devastated, afraid her secret past will be revealed. That outcome threatens to disrupt the life and career she has created, and possibly to derail Matt's campaign. A vicious series of posts on social media, spurred by online provocateurs of violence named the True Men Movement, call for the disruption of the upcoming national elections. Despite threats to their safety, Sarah and Casey carry on. Readers will furiously turn the pages to see how it all ends. Agent: Katherine Fausset, Curtis Brown. (Sept.)