Suspect No. 1

When a man is found badly beaten on the side of a road with little recollection of what happened, Detective Sergeant Lee Marriner and Detective Constable Craig Weir must check all the available images to see if they can find any leads.

During a lads' night out, an interaction with a stranger leads to a violent attack that leaves one of them fighting for his life in hospital. Police must work to track down the assailant.

Detectives are tasked with bringing down the Norfolk-based Lewis drugs gang, and in particular, the man at the top of it who oversees the selling and dealing of crack cocaine and heroin at street level.

In Norwich, a specialist team of detectives are battling to bring down 'county line' gangs, which are flooding the city with illegal drugs brought in from beyond the county borders.

In a spate of terrifying shop robberies, the criminals brandish a meat cleaver and knife. Police must act quickly before the violence escalates.

Victims are terrorised in their home by a knife-wielding intruder, twice in 24 hours. The race is on for police to catch the hardened criminal and his accomplice before another strike.