Guy is taken hostage and forced to hold a live grenade while the hospital is evacuated. The grieving husband of a deceased patient blames him for his wife's passing and wants revenge. Will Fletch have to sacrifice himself to save Guy? Ollie and Zosia's feelings for each other are brought into sharp focus when they're placed in a life-or-passing situation. Dom thinks he's being tested when Hanssen gives him a tricky patient to deal with - a man who is already suing his last doctor.
This series is a spin-off from the long running BBC medical drama Casualty. Set in the same hospital as its sister series, this show follows the everyday lives, professional and personal, of the doctors, nurses and patients who find themselves, for various reasons, in the wards of Holby City General Hospital