Casey tries to convince everyone he is healthy, Shay avoids the lawyer who wants to talk about Daryl's suicide, Otis and Katie grow closer, and Boden helps a woman with a negligent landlord.
Firehouse 51 joins forces with the Chicago Police Department to combat a massive explosion that leaves the city in carnage and one of the crew missing.
Trevor is involved in a fender bender; Denise rents a creek house when Frank is deployed to Iraq; Pamela gets the chance to confront her stalker; Michael officially presents Trevor with a Silver Star Medal.