In the concluding episode of this compelling two-part story, new arrival Professor John Gaskell (Paul McGann) finds himself caught in the middle of a shocking incident quickly unravelling on the hospital wards and we get to see how he handles things in a crisis. After all that’s happened in recent weeks, the hospital is plunged into darkness as Holby faces its greatest threat yet…

Meanwhile, despite his suspension from Holby after the hearing, Ric manages to find his way into the chaotic hospital following a string desperate phone calls from Donna. Will he be able to help?

How will Ric, Henrik (Guy Henry) and all our other Holby heroes cope when everything they know is put in jeopardy?