Simone Clark sets her sights on joining Matthew Garza’s newly formed special unit as they investigate the murder of a federal engineer. Simone and Cutty’s relationship is tested as their opposing opinions about law enforcement come to a head.

When Garza’s character comes into question, Simone and team develop their own covert operation to support their boss

The FBI takes on a case from LAPD involving a serial murderer who has been leaving limbs across state lines. After the team follows a lead from Antoinette and Elena's forensic breakthroughs, the killer retaliates against Laura.

The crossover starts on The Rookie S05E21 Going Under (I).