When James Irving is shot dead in broad daylight in the middle of a bustling market town, the police are left with an inexplicable murder scene. No witnesses saw where the sniper's bullet came from, and there is no clear motive. Assigned to the case, Rose and Raj hit a wall. James was a well-liked man with no obvious enemies, and despite clear CCTV coverage of the square, the killer remains completely invisible.

As media and political scrutiny intensifies, opportunistic county councillor Jeffrey Cecil seizes the tragedy to whip up public hysteria, stoking anti-outsider sentiment and fear. Out of options, Rose turns to Joe. Knowing his military background and his uncanny knack for reading human psychology, she brings him into the investigation, reuniting the pair to crack an impossible case.

The stakes skyrocket when a second shooting occurs in identical, ghost-like fashion. This time, Rose and Raj uncover a critical link: both victims were army veterans. Facing unprecedented pressure from local politicians and journalists, and James's understandingly demanding widow, Marissa, Rose finds herself under a spotlight unlike anything she has handled before.

To trace the military-grade weapon used in the attacks, Joe is forced to approach Ace, whose help always comes with a cost. Turning to such an untrustworthy ally places Joe in a hugely difficult position, but one that's worth it to help Rose. Working against the clock, Rose, Raj and Joe must untangle the connection between these fallen soldiers to expose an elusive sniper before another target ends up in the crosshairs.