The couple realizes that the "Beast Buyers" are looking to weaponize beast DNA. Cat is forced to go undercover, risking her badge and her life to infiltrate a ring of elite mercenaries. Vincent struggles with his beastly instincts, fearing that the more he fights, the more of his humanity he loses. The Grand Finale (Episodes 10–13)

In episode 4, Cat wonders if she is pregnant, adding personal stakes to their already chaotic lives.