Gordon's alive? The English Channel, May 1945. Leading his squadron of Hawker Typhoons back to base from a traumatic mission in the Baltic, Wing Commander Gordon Lethbridge-Stewart goes missing – one of the unsolved mysteries of the Second World War. Cromer, 1970. Doctor Anne Travers and Lieutenant Bill Bishop are investigating a mysterious phenomenon after hearing reports of ‘pink lightning’ seen over the Norfolk coast, while strange elfin creatures are glimpsed by the locals. And in the Red Fort, his new base of operations deep below Norwich, General James Gore is making his plans. Brigadier Alistair Lethbridge-Stewart receives a phone call that will change his life. Could it be, after all this time, that his father has come back from yesterday?