The fourth episode follows the West Midlands Ambulance Service at the beginning of a busy Saturday night shift. There's been a nasty car accident in Warwickshire and the young driver has suffered a collapsed lung. She needs a life-saving procedure by the roadside which can only be done by a doctor. The Merit team, a specialist resource reserved for the most serious cases and with a doctor and specialist paramedic on board, is immediately dispatched.

In the busy control room, call assessors Rowena and Sally are both dealing with suicidal patients on the phone, while controller Louise and dispatcher Lucy urgently find available ambulances to send to them.

As crewmates Jo and Suki take their patient to hospital, a car dramatically crashes in front of them and they find themselves with several more patients suddenly on their hands. Another three ambulances are needed on scene but with all crews in the area already assigned to jobs and new calls still coming in, Lucy and Louise must prioritise those most in need.

By the time pubs and bars begin to close, alcohol seems to be the culprit of more and more of the calls coming in and in Birmingham city centre, a woman has had her finger bitten off at an argument at a gig.

On Sunday, a man has dislocated his knee for the fourth time over the week and is in agony and stuck at the top of some tricky stairs. But as the weekend shift draws to an end, it's an elderly woman who lives on her own who the crew are most concerned about. Show less