Hard drugs, gang members and the threat of terrorism all combine to prove that modern-day policing isn't just about robberies and ASBOs. Despite his professional heroics, DI John Keenan has to face facts about his marriage, while probationer Lucy Slater has a baptism of fire at Holby South.

When a case involving a local gangster gets personal, PC William Jackson faces a difficult choice. Kate has an interview at the station and John regrets his night of passion with Rachel.

John and the relief launch a big raid on local gangster Neculai Stenga, only to find thiinks don't go according to plan. Desk sergeant Mac is forced to face his shortcomings as a copper and we discover that Stenga has a close friend on the police force.......only who is it?

In his dealings with a local tramp, PC Clifton discovers his compassionate side. Following the failed raid on Stenga, John starts to self-combust.

Some uncomfortable truths emerge when Inspector Black's husband is brought into the station. Robert and Lucy are on the hunt for a vigilante attacking doggers.

Following an investigation into a violent bouncer, John gets the shock of his life. Kate and Rachel's feud escalates. Lucy looks for a missing baby and regrets making a rash promise.

Harry offers to provide evidence against Stenga who, discovering what is going on, decides to take action. An elderly woman calls at the station, claiming to hear voices that tell her about future crimes.