A computer virus shuts down Holby’s power, putting Jac and Connie at loggerheads as they fight against all odds and in makeshift conditions to save the lives of close friends and colleagues. During a hospital-wide evacuation, Ric mounts a daring rescue for a trapped and weakening Essie – even as he struggles with a shocking revelation about Darla. In the midst of chaos, can Ange and Serena agree on how best to care for Holly, who continues on life-support?