Tracking down every missing first responder in Rocksteady's gritty open-world sandbox forms the core of the compelling Line of Duty side mission. As the Caped Crusader navigates the rain-slicked streets of Gotham, saving these captive public servants from violent street gangs becomes crucial for unlocking the city's true ending. This guide offers tactical insights into tracking down all fifteen crew members and their missing chief across the three primary districts.

Securing the Captured Crew on Bleake Island

Your search begins on the northernmost island, where six members of the station seventeen crew are currently held hostage by hostile rioters. The initial location at Dixon Docks is automatically marked on your map to introduce the mechanics of these intense combat encounters. You must actively listen for police scanner transmissions or look for groups of thugs gathered in unusual spots to find the remaining victims.

Notable rescue zones on this island include a heavily guarded yard near the Falcone Shipping Antenna and a secluded spot underneath the massive Crane Industries building. Another group of criminals holds a target captive near the Chinatown waterfront under the cover of dense urban infrastructure. Approaching these positions quietly allows you to eliminate weapon-carrying lookouts before they can threaten the safety of their hostage.

Locating the Hostages Across Miagani Island

Moving south into the neon-lit entertainment districts reveals five additional crew members awaiting dynamic intervention. One highly hazardous encounter takes place near the Gotham Herald building, where armed guards watch over their target from elevated vantage points. Players must leverage the Dark Knight's diverse gadget arsenal to blind automated turrets or disable firearms before diving directly into the fray.

You will also find crew members trapped near the Grand Avenue rail station and hidden away within the lower levels of Wayne Tower. Another crucial encounter is situated near the Ranelagh Ferry Terminal, requiring swift architectural traversal to bypass environmental obstacles cleanly. Clearing out these combat arenas systematically ensures the safety of the city's finest while filling out your total mission completion metrics.

Clearing the Final Nodes on Founders Island

The highly militarized streets of the western district contain the remaining four crew members who are guarded by advanced merc loadouts. These encounters feature significantly higher difficulty curves, often incorporating armored brutes, tactical ninjas, and structural security systems. One prominent target is trapped near the Ryker Heights waterfront behind a complex network of automated defenses.

Another operation takes place near the massive LexCorp construction site, where vertical architecture dictates your combat approach strategy. You must also explore the lower slums of Drescher to locate a group hidden beneath an overpass. Successfully wrapping up these final district objectives unlocks the location of the missing chief to conclude the narrative arc.

Rescuing Chief Underhill and Completing the Mission

Once all fifteen initial crew members are safely returned to custody, the exact coordinates of the missing chief will finally reveal themselves. You will be directed back to a highly secure facility where a massive gathering of armed elites holds the leader captive. Utilizing fear multi-takedowns and environmental disruptions is essential for managing the overwhelming numbers in this final arena.

After neutralizing the final threats, interacting with the chief triggers a dramatic narrative twist regarding the origins of the incident. You must then safely escort the target back to the GCPD lockdown facility to complete the side quest fully. This final step secures the associated trophy and brings lasting justice to the chaotic streets.