Victims of an explosion flood the emergency room; surgeon Percy Dean returns; a boy dies while under anaesthesia.

There are gangland bullet wounds, radical new techniques and personal dilemmas at the hospital. Plus, patron Queen Alexandra is due to visit.

It is a long hot night and children are dying from a diarrhoea epidemic. This is hard for some of the staff, but as dawn breaks there is new resolve.

The chairman launches a fundraising effort; tunnel workers suffer mysterious symptoms; Dr. Koch prescribes new treatment for Mrs. Turner.

Ethel Bennett and Dr. Culpin try to control angry victims of an explosion; Sister Ada Russell clashes with surgeon Henry Dean; Dr. Ingrams faces catastrophe in the operating room.

Nurse Bennett fears her secret alliance with Dr. Culpin has been discovered; Matron Luckes sends Bennett into private nursing; a new wonder drug may not be so perfect.