When registrar Sally Fortune collapses, Monroe (AKA Jimmy Nesbit showing off his new hair) is faced with the terrifying prospect of operating on a colleague. Fortune's condition is serious - she has an aneurysm in her brain which could burst at any moment, and one wrong move during surgery risks leaving her permanently damaged. She places her trust in her mentor, but when the procedure begins to go badly, Monroe has to hold his nerve in a race against time to save his registrar. In other dramatic happenings, Bremner reaches a decision about her relationship with Shepherd, and Monroe helps his estranged wife Anna build a new life.