NBC has shared eleven promotional images for Chicago Fire season 3 episode 21, "We Called Her Jellybean" - airing April 29th.
In this episode, an apartment fire linked to a case of rape and attempted murder calls for members of the CPD to team with the Special Victims Unit, which had a similar unresolved case that has eluded them for more than 10 years. This prompts Sgt. Benson to come in from New York to assist with the investigation in which she is all too familiar.
For much more spoilers, visit Chicago Fire episode guide.