Christian Lamb, aged 101, is one of the last surviving Wren Officers to have served her country throughout the whole of the Second World War. As Third Officer, plotting the progress of the Royal Navy's ships became an intensely personal mission for Christian when her fiancé John's ship HMS Oribi, was surrounded by a U-boat 'wolf-pack'. Newly married, Christian was next posted to a vital role back in London COHQ. In a basement office in Whitehall, she worked on top secret maps for the D-Day landings. A remarkable story from a remarkable woman.