Pc Diane Noble returns to Sun Hill newly promoted to Sergeant. And she gets a baptism of fire on her first shift… The station gets a call about a group of teens partying on a roof at a building site. Diane rounds up her team and heads to the location. As the police arrive, some of the kids run off, but Diane notices one boy dangerously near the edge of the roof. His name's Kieron and it's clear to Diane that he's under the influence of drugs. She starts to talk him to safety but then the drugs cause his body to seize and he falls off the roof. Diane's investigation leads her to Kieron's sister, Sarah, a drug addict. The evidence suggests that Kieron got his drugs from her but Sarah insists she's been clean for months. However, her ex-boyfriend, drug dealer Ray, is the bad boy he always was. Sarah tells Diane where to find Ray and the police set out to trap the drug dealer. But their plan doesn't work and Diane gets a call for help from a frightened Sarah. When she gets to the young woman's house, she finds her bleeding on the floor...
