A botched operation leads Ash to join the UNIT: a new undercover law enforcement team, operating outside of the police to get to the criminals at the very top.

A dispute in a busy market ends in a tragic shooting, and guns flood the streets of London. The UNIT must stop the latest shipment before the guns can claim more innocent lives.

Ash clashes with Cartwright when the Unit set out to follow some dirty money back to it's source and find an innocent man out to save his family's honour at all costs.

Under pressure, Roach's gang turn to a ruthless new supplier. Ash and the team have to find him before the streets are flooded with dangerous drugs.

A young girl's death alerts the UNIT to a batch of lethal pills, and tracking down a kidnapped woman may hold the key to finding the factory churning them out.

A notorious armed robber arrives in town and when Ash's oldest friend simultaneously turns up, he is forced to choose between old and new loyalties.