The Number of Rats
Season: 2
Episode: 20
Original airdate: April 29, 2015
Teleplay by: Matt Olmstead
Cole Maliska
Story by: Matt Olmstead
Warren Leight
Directed by: Nick Gomez
Episode chronology
Previous episode: The Three G's
Next episode: There's My Girl


Benson has traveled into Chicago to help Voight and intelligence with a rape/murder case that is frighteningly similar to a case from New York a decade ago. She calls in Fin and Amaro to assist. The prime suspect, Yates is let go after rigorous questioning. He then requests a meeting with Lindsay and he warns of unintended consequences from what intelligence is doing.


Main Cast

Special Guest Stars

Guest Stars


  • Rachel Melius as Charlotte Reegan
  • Laura Lapidus as Janine
  • Jeff Parker as Doctor Smith
  • Tiffany Bedwell as Victoria Lewyn


Background information and Notes

"In the criminal justice system some killers are so depraved that it takes multiple police agencies to bring them to justice. This is one of those investigations."

Episode scene cards

  • This crossover adopted the Law & Order style of using scene cards both for the SVU and Chicago P.D. episodes.
1 2 3

Apartment of
Victoria Lewyn
3545 Silverhill Street
Chicago, Illinois
Saturday, April 11

Apartment of
Charlotte Reegen
2037 West Armitage
Chicago, Illinois
Sunday, April 12

Millennium Park
Chicago, Illinois
Sunday, April 12

Chicago P.D. season 2
Episodes Call It MacaroniGet My CigarettesThe Weigh StationChicken, Dynamite, ChainsawAn Honest WomanPrison BallThey'll Have to Go Through MeAssignment of the YearCalled In DeadShouldn't Have Been AloneWe Don't Work Together AnymoreDisco BobA Little Devil ComplexErin's MomWhat Do You DoWhat Puts You on That LedgeSay Her Real NameGet Back to EvenThe Three G'sThe Number of RatsThere's My GirlPush the Pain AwayBorn Into Bad News
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