In Edinburgh, PC Fraser Bell severs his artery while trying to restrain a youth, but his quick-thinking colleague saves his life by stemming the blood flow. In Manchester, PC Ian Bruce is part of a specialist team tackling vehicle crime. It's a dangerous job, often involving high speed chases, and Ian finds himself alone and vulnerable as a gang he's chasing go on the attack, using their car as a weapon. And paramedic Jodie Nutley-West is shocked when a patient suddenly lashes out.

In Bedfordshire, PC Hayley Robinson has her ankle crushed after being driven at by a criminal in a car. But after five months of treatment she's ready to go back to work. Elsewhere, fire crews across the country prepare for Bonfire Night – the worst night of the year for violent attacks on firefighters. And Saturday night revelry ends with a police officer needing stitches after an unprovoked attack as the clubs and bars kick out.