Dawson makes an attachment to a young boy she rescues in an apartment blaze while Kidd's big idea for Molly's turns into a disaster. Lt. Severide makes a pitch for the house to upgrade some of their fire masks but hits a wall in his efforts, prompting Lt. Casey to use his political influence to pull a few strings. Meanwhile, Cruz and a reluctant Brett bring in a secret weapon in their efforts to get Otis to see Dr. Halstead and take a blood test.