SVU and Chicago PD officer Erin Lindsay try to track down Lindsay's half-brother, who may be able to help take down a child pornography ring.

The crossover starts on Chicago Fire S03E07 Nobody Touches Anything (I). It continues on Chicago P.D. S02E07 They'll Have to Go Through Me (III).

A Chicago crime resembles a decade-old New York City case, so police from Chicago arrive and team up with the squad to track down a suspect they had to release earlier.

The crossover starts on Chicago Fire S03E21 We Called Her Jellybean (I) and Chicago P.D. S02E20 The Number of Rats (II).