Best guess as to where their killer will strike next taking the team into the storm drainage tunnels under the city, Detective Beck Nash seeks help from a trusted old friend, while going head-to-head with a recruit with whom she couldn't have less in common.

21 Weeks is a fast-paced police procedural thriller series that ramps up in intensity with each victim that falls until its explosive final week.

Warning: This series is about a serial killer. There will be violence. There will be language. There will be other adult things. It is intended for a mature audience.