Erin Breen

Severide and Kidd continue to investigate Benny's old arson case, unexpected news leads Brett to ponder a big decision and all hell breaks loose.

Nervous about Laurie's next steps, Richard takes matters into his own hands, letting his ego get the better of him during an interview. Dinesh, Gilfoyle and Jared misplace an important piece of hardware. Erlich faces unexpected pushback pitching his plans to Big Head.

Chief Boden unwillingly agrees to let Dawson and Brett go undercover; Kidd and Zach's relationship hits a bump; Cruz has a hard time expressing his true feelings for Brett.

Severide finds a connection between a recent salon fire and a case involving a serial arsonist. Plus, Firehouse 51 throws a retirement party.

Severide and Boden investigate a fire at a hair salon. A shocking discovery is made in the search for the missing piercing nozzle from Engine 27.

Chief Boden turns up the pressure on Severide and Casey to investigate the cause of the fire that trapped his wife; Mouch is over-competitive in the firefighter muster challenge.