During a recent murder investigation of an investment banker, who was also declared murdered six years ago, the unit follows a suspicious trail that leads to new evidence on both cases. Meanwhile, relationships are put to the test as Fortune considers her future with Carter, and Brendon pushes his limits with Antoinette.

It’s Valentine’s Day, and love is in the air. The FBI teams up with LAPD to take down a shady Casanova linked to a notorious drug lord. While the rest of the team celebrates with their new loves, Simone connects with someone new.

Garza and the team are on the hunt for a ruthless gang leader on a mission for revenge. Atlas comes to town to reconnect with Laura, but the two cannot seem to see eye-to-eye, and Simone and Carter grapple with letting go of old grudges.

The crossover starts on The Rookie S05E17 The Enemy Within (I).

After a group of robbers steal a diplomatic pouch, Naomi and the Feds work to prevent an international counterfeit scandal. While Garza reconnects with an old friend, Brendon’s sponsor relapses, and he rethinks his relationship with Antoinette.

As Simone is doing office inventory, she uncovers a trail of bodies that leads her to investigate a case involving a reclusive business tycoon. Meanwhile, Laura and Brendon track down an evidence thief and Carter works to prove Fortune’s innocence.

It’s a race against time as the Feds band together to stop death row inmate Foster and his cult following’s killing spree ahead of his execution. Meanwhile, as Cutty and Ruth’s relationship gets serious, Simone and Dina are forced to reconnect.

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).

After an internal investigation unit agent is drugged and buried alive in a desert outside of Vegas, the Feds director enlists Garza's unit to discreetly investigate. Meanwhile, Simone's plans for her 49th birthday bash are sidelined.