The heat is on in Atlanta when the BAU investigates murders of women and realizes they are looking for more than one unsub.
Travis discusses his position in the mayoral race as he is determined to kick Dixon out; Maya admits to blackmail; the team is called to a fire at a run-down apartment complex that reveals an unsettling cause.
While Pruitt grieves a monumental loss, Andy refuses to do the same and, instead, throws herself into work; the crew responds to a widespread carbon monoxide leak; Sullivan makes a controversial choice for captain.
After some tense and traumatic experiences, the firefighters get a visit from a psychologist.
The new Seattle fire chief is introduced to Station 19 and leaves the crew skeptical; a department store fire caused by exploding fireworks triggers painful memories from Ben's past and inspires him to pursue a new endeavor.