Severide, Kidd and Van Meter analyze a fire at a recording studio; Kylie helps James keep a secret; Mouch attempts to enforce boundaries with a client.
Carisi opens a police investigation when his niece reports a classmate for sexual assault, but Stone learns that sex crimes don't have perfect witnesses.
Over 3,500 athletes from 93 countries compete for medals in 16 disciplines at the third Winter Olympics in Italy and first to be split between two cities.