A vegetation fire gets complicated for the crew when a panicked horse refuses to evacuate a burning barn. Meanwhile, Vince's brother Luke, the Cal Fire communications director, makes a surprise visit in town.

An internal investigator suspects Jake of being the serial arsonist setting recent fires, so Bode and the crew take it upon themselves to investigate.

With the future of Three Rock in jeopardy, Station 42 and Three Rock host Edgewater's 22nd Annual Firefighters' Ball in an effort to impress the governor and save the camp. Meanwhile, Gabriela's mom, Roberta, makes a surprise appearance at the event.