Andy and Sullivan find a way to stay connected; Ben confronts a tough loss, and Jack and Inara grow closer. Meanwhile, while off duty, the crew jumps into action to help a mother in distress, but their heroic efforts spark conflict with police officers who are less than eager to offer support.

The Station 19 crew is called to a cult gathering where they find their leader dancing on the roof and claiming he can fly. Travis gets a surprise visit from his father. Dean makes a difficult decision that could affect his career trajectory.

When a heat wave hits Seattle, Station 19 becomes a cooling center and chaos ensues with locals who aren’t used to the extreme temperatures. Andy deals with regret and finds a friend in Theo. Joey comes face-to-face with his past during a ride-along with Ben and Jack

Maya and Theo answer a call at a Halloween carnival; but when fire hits the corn maze, the dangers quickly escalate and Maya risks her own life to prove her worth to her increasingly hostile captain. Meanwhile, Station 19 hosts the neighborhood kids for trick-or-treating; a prank war breaks out in the house, and Jack is haunted by a ghost from his past.

The team is forced to make a risky call that could cost them dearly after Tomás’ barbershop catches fire. Diane drops by the station and is called back into action alongside Vic and Carina. Beckett makes a decision about his future.