Will finds himself having to go undercover in his first proper case with CID.
- Gary Lucy as TDC Will Fletcher
- Doug Rao as DS Stuart Turner
- Sally Rogers as DC Jo Masters
- Alex Walkinshaw as Sgt Dale Smith
- Jason Barnett as CSE Eddie Olosunje
- Amita Dhiri as DC Grace Dasari
- Ben Richards as PC Nate Roberts
- Rhea Bailey as PC Mel Ryder
- Louisa Lytton as PC Beth Green
- Ali Bastian as PC Sally Armstrong
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