More clues surface surrounding the fire that killed Shay,leading Severide to a most unexpected source who may be able toprovide pertinent information. Meanwhile, Shay's sister Megancomes to town, prompting members of the firehouse to rememberShay's life. Elsewhere, Cruz is in for a surprise when Otis'sgrandmother moves into their apartment, while Boden finds away to help his dying father make the most of his last fewweeks.
