The detectives are spread thin when three major cases come in at Midnight. Rollins and Carisi argue over an arrest.
Needing space after a fight with Desi, Marnie goes for a walk and has an unexpected run-in with someone from her past.
Reagan family tensions run high when Frank and his grandson, Joe Hill (Will Hochman), contend with a grievous insult to the memory of Joe's father, Joe Reagan.
