When DCI Gene Hunt's former Manchester colleagues, DCI Litton and DI Bevan, turn up on his patch he immediately smells a rat. They're in pursuit of northern comic Frank Hardwick who's wanted for stealing 2,000 pounds from the Police Widows Fund. However, their desperation to track him down leaves Gene and DI Alex Drake suspicious of their real motive.

All hell has broken loose at Fenchurch East prison; the inmates are rioting and DCI Gene Hunt is ready to go in all guns blazing to teach the lags a lesson. However, things don't go to plan; the riot team are hugely outnumbered, and in the chaos of the retreat someone is left behind.