When Cat and Leo discover a man who was exposed to a weaponized toxin in a dumpster, the NYPD goes into high alert.

When a maid from El Salvador is shot in Brooklyn, Cat, Leo and Frankie discover she is actually a former cop from Venezuela who is in town seeking revenge.

What Cat arrests a member of Jungle K's gang, he gets a hold of a gun and shoots up the precinct, leaving two cops dead.