Suspicious of the circumstances surrounding her mother's death, Andy goes looking for answers. Meanwhile, the members of the crew work to evacuate a doctor from Pac-North hospital and find themselves in a life-threatening situation; and Sullivan undergoes surgery for his chronic leg pain.
Ben, Jackson and Emmett are put in a precarious and dangerous position with a potential victim. Meanwhile, Andy's search for more background on her family opens her eyes, and Vic and Travis are caught in the middle of a corruption scheme.
Andy returns to work while she and Jack fight to save people trapped in a collapsing bowling alley. Meanwhile, Ben confronts Sullivan about his drug problem; and Maya's mother, Katherine, pays Maya a visit.
Andy and Sullivan are thrown into action when the restaurant is raided by the ICE; Travis joins an awkward lunch with Chief Dixon, Emmett and his girlfriend; Surgeons from the Grey-Sloan Memorial are invited to see the new PRT vehicle.
When an Army veteran threatens to blow up a pawn shop, Sullivan reflects on his time as a Marine to deescalate the situation. Meanwhile, Vic and Dean try to reason with a man battling Alzheimer's disease; and Pruitt takes a stand to honor fallen firefighters.
In an effort to increase morale, Maya takes the crew on a team-building camping trip that doesn't exactly go according to plan. Their bond is put to the test as they work to save first-time campers after a gruesome bear attack. Meanwhile, Pruitt takes steps to repair his relationship with Andy, and Sullivan goes to extreme lengths to find relief from the pain in his leg.
Ben and Jack mollify a group of homeless foster and biological siblings so they can help save a life, triggering memories from Jack's past. Meanwhile, Maya pushes the team too hard and struggles to bring them together; and Pruitt threatens to take drastic action when refused a request.
While Pruitt grieves a monumental loss, Andy refuses to do the same and, instead, throws herself into work. Meanwhile, the crew responds to a widespread carbon monoxide leak, and Sullivan makes a controversial choice for captain.
The new Seattle fire chief is introduced to Station 19 and leaves the crew skeptical after his visit. Later, the firefighters are called to a department store fire caused by exploding fireworks, which triggers painful memories from Ben's past and inspires him to pursue a new endeavor. Maya advocates for herself and her career, while Jack becomes more intertwined with an acquaintance; and Andy and Ryan have a heart-to-heart.
After a car crashes into Joe's Bar, Andy and Sullivan lead the team of firefighters as they work to rescue their fellow crewmates Ben and Pruitt, Grey Sloan doctors and interns, and bar patrons before the building comes crumbling down.