After an explosion destroys a crime scene, Carrie's memories become essential to the investigation.

When Al’s ex-partner is gunned down and the investigation reveals he may have been a dirty cop, Carrie must decide how to support him without getting too close

When a second murder suddenly occurs at an active crime scene, Al and Carrie must wade through hundreds of bystanders to uncover if it was retribution or an unrelated attack.

Al and Carrie are forced to the sidelines by a negotiator when the father of a suspect that Roe shot takes members of the Queens PD, including Nina, hostage in a desperate quest for justice.