A vigilante posts a video online of a man, previously locked up for statutory rape, being beaten and burned alive; Lindsay encounters some personal and professional problems.
Move A Wall. Move A Wall. Tensions run high between Casey and Herrmann after the firehouse responds to an apartment complex fire. After discovering something extremely suspicious during the call, Kidd and Severide do some investigating and get CPD on the case
Infection Part 2. An entire apartment complex is forced into quarantine when cases of the deadly virus turns into an epidemic.
Infection Part 1. In the first part of a three show crossover event, a rare but deadly bacteria takes its toll on numerous victims around the city.
Lindsay's mother, Bunny, becomes a murder suspect when her boyfriend is shot; high school students overdose on drugs; Lindsay finds herself up against the review board.