Years after ending their relationship, former Army Rangers Jay Halstead and his ex are unexpectedly reunited when she joins Chicago P.D.‘s Intelligence Unit. Once bonded by love, war, and shared trauma, they are now forced to work side by side while Jay is in a committed relationship with Hailey Upton. As one of the most decorated snipers to come out of the Rangers and later one of the top snipers in federal law enforcement, she quickly earns the team’s respect. But with old feelings resurfacing and dangerous cases testing everyone’s loyalty, the past proves far more difficult to leave behind than either of them expected.