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).

The squad revisit a crime scene where bodies were buried by a serial killer. Rollins tries to get a confession, but the killer reveals shocking new info instead.

A serial killer reveals shocking new info and problems in the case mount as Barba faces slick lawyers in court.

Chicago P.D. detectives Lindsay and Dawson join the SVU in the hunt for two escaped murderers they helped to convict.

The crossover continues on Chicago P.D. S03E14 The Song of Gregory Williams Yates (II).