Detective Dinah Kowalska uncovers a sinister pattern in two deaths. Friday Street Station confronts a twisted serial killer.

Deering's team loses the serial killer case to Maclaren. Dinah's involvement complicates. Amid recriminations, a chance for redemption arises as a deadly new street drug wreaks havoc.

Escalating racial tensions follow an Asian woman's suspected hate crime murder. An undercover mission targets the prime suspect. Deering rejoins the serial killer probe, but time is critical; Dr. Peep believes the murderer will strike again soon.

DI Vivienne Deering and her Friday Street team uncover a kidney-selling scam for debt relief. The search for a kidnapped girl brings a vital breakthrough in the serial killer case.

DI Deering's team faces hurdles: serial killer trap fails, leaked child murderer's ID demands swift, strategic adjustments to salvage the operation.

Deering leads a Manchester manhunt for the serial killer. Simultaneously, Joy and Spike uncover a harrowing slavery case after a brutal assault on a homeless man.