A cracking episode begins in shocking style – but why is Tristan lying motionless on the floor in a tuxedo? As we rewind 24 hours, we see dramatic scenes, including the press launch for Guy’s new neurosurgery unit, despite Ric’s misgivings, the re-admittance of Tristan’s lover Jemima to the ward, a surprise visitor to hungover Serena on Jason’s first day as a porter and a very fancy gala dinner attended by Tristan’s best friends and worst enemies.