Episode 1

One of the UK's most prolific sex offenders ever, David Carrick took advantage of his position as a serving officer to attack women for nearly 20 years.

Episode 2

When police arrive at a devastating car accident, they find a young woman with horrific head injuries. But her fiancé, officer Martin Forshaw, is barely hurt.

Episode 3

A police car executes a stop and search on a drugs courier, seizing hundreds of thousands of pounds - but serving officer Kashif Mahmood then lets the driver go.

Episode 4

When royal protection officer Michael Coulton's wife is found murdered just yards from her work, a few of his secrets begin to come to light.

Episode 5

Australian officers couldn't believe it when they intercepted a call to an international drugs cartel and heard their senior officer Mark Standen on the line.

Episode 6

An unknown blackmailer laces dog food with poison and baby food with glass, always able to stay one step ahead of police - until his true identity is revealed.

Episode 7

When sergeant Drew Peterson's wife Stacy goes missing, he claims she's left him for another man - but it's then discovered that his ex-wife also died mysteriously.