This episode serves as the first part of a crossover with The Rookie: Feds , with the story continuing in the Feds episode where they investigate Rosalind’s killer.

Bailey Nune is lured into an abandoned house for a medical call and falls into a concealed tank that begins filling with water.

Rosalind contacts Nolan and forces him to meet her at a remote location, threatening to kill Bailey if he alerts his colleagues.

The LAPD and FBI (including agents from The Rookie: Feds ) join forces to locate the trap. Detectives Harper and Lopez work with FBI agents Laura Stensen and Brendon Acres to track down Rosalind’s accomplice, Jeffrey Boyle, who is building similar traps.