Weeks into hitting the beat, the trainees realise learning on the job can mean making mistakes in full view of a very critical public. Jack stops and searches an innocent couple after being told off for not being proactive enough, while Dan breaks a crucial rule when he runs into trouble on his first night shift, Julia's lack of experience in the drug world means she misses a vital clue when faced with heroin for the first time, and away from work she worries about her 22-year-old son, who has followed her career path and just joined up.

In the climax of the series the rookies are finally about to hit the streets alone, away from the watchful eye of their partner. 46-year-old rookie Mark’s last shift with veteran officer Mike is one of his most challenging yet – he's called to help a man whose been attacked with a baseball bat after trying to meet a prostitute. But it's the families who are most concerned about the rookies facing the county's most dangerous criminals alone. Recently married Dan attends a near-fatal stabbing during his first solo shift while his husband anxiously awaits his safe return home. 26-year-old Jack's mum might finally be used to him having his own house but that doesn't stop her worrying about her son having to arrest abusive members of the public. And 46-year-old Julia's grandmother has a unique insight into the demands of her new role - she was once one of the UK's first female PC's.