The 51 are sent to a prison to do a job and all hell breaks loose. Cindy goes into labor. Shay learns the results of her pregnancy. Mills learns about his chances to make squad. A familiar face returns to Severide's life.
The team faces a hell of a ride when a small prison fire turns into a much more dangerous situation. Meanwhile, Cindy Herrmann goes into labor, Shay is anxiously waiting for her pregnancy test results and Mills faces a turning point in his love life and his career.—stephie_j