Mills and Brett race to recover a missing teenager and are left stranded in the unforgiving elements, while the rest of Firehouse 51 babysits an abandoned newborn. Meanwhile, Lt. Severide receives an interesting job proposal and Chief Boden finds himself at odds with his father over his treatment and the planning of a big party in his honor.

Chief Pridgen comes under fire after making a tactical error during an apartment fire for which he throws Lt. Casey under the bus, leading Lt. Severide to take it upon himself to clear the problem. In an effort to further cover himself from any wrongdoing, Pridgen enlists the help of Lt. Welch, who is faced with the choice of whether to fit in with the firehouse or follow his superiors self-serving orders. Elsewhere, Mouch is floored upon learning that his donation to a fertility clinic has resulted in a child who, now a young adult, wants to meet him. Meanwhile, Brett and a reluctant Cruz take Dawson out on a double date and Boden focuses his efforts on his duties at home as a father.