Walter, a 57-year-old man, has has been brought in to A&E suffering serious chest pains. Nurse Amanda Brown provides pain medication, but it is confirmed that Walter is having a heart attack and will need an air ambulance to take him to the mainland for vital heart surgery. Paramedics are called to Scalloway to reach an elderly patient who has fallen and hurt herself. It isn't the first incident, and she is having trouble taking medication. Consultant physician Professor Chris Isles is determined to find the answer. And nurse Marie Stemp and Dr Hazel Thompson need to improvise when a patient arrives at A&E with an injured foot. French fisherman Jimmy speaks no English, and the medics don't speak French.

Dr Lalla is frustrated by summer fog which means the air ambulance cannot land. To get his patient to specialist care, he urgently needs the coastguard helicopter - and the fog to clear. A South African with Shetland roots learns to always listen to his mother. She convinces him to get his foot x-rayed after a nasty stumble, and a fracture is diagnosed. And senior staff nurse Emma Williamson suspects the cause of an asthma attack is more serious than it first appears.

A carrot cake causes a major emergency when an oil rig worker with a nut allergy eats some after his shift. Evacuated to Lerwick, he is treated by the team in A&E. A young man's attempt to vault a fence after a few drinks doesn't go as planned when he fractures his ankle in three places. And Dr Ruth Booth starts a six-day stint as GP on Unst, the northernmost inhabited island in the UK.