NBC has released description for Chicago Fire season 3 episode 21, "We Called Her Jellybean" - airing April 29th. 

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A FIRE REVEALS EVIDENCE OF A POTENTIAL SERIAL ARSONIST WHO HAS BEEN ON THE LOOSE FOR MORE THAN A DECADE AND DEMANDS THE ATTENTION OF THE CPD AND SVU

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. Meanwhile, doubts among the squad towards one of their own causes Severide to lay down the law and Dawson puts her life on the line during a call. 

STORY ARC CROSSES OVER INTO "LAW & ORDER: SVU" AND "CHICAGO P.D." THE FOLLOWING NIGHT