Det. Kennex and Dorian investigate a crime scene involving a self-guided bullet that can track, target and kill specific people at any moment. Meanwhile, Maldonado revisits the deadly ambush that almost killed Kennex.

When Det. Kennex and Dorian investigate the simultaneous and sudden deaths of two genetically-enhanced - or "chrome" - children, a fatal dose of the perfect designer drug appears to be the cause. As the investigation unfolds and a recent drowning victim is mysteriously connected, the case takes an unexpected turn. Meanwhile, Kennex endures painful flashes from the past and pays a visit to the recollectionist.