At last, Archer, Harry and Sylvia put their squabbles behind them and pull together to carry out a daring mission to save the king.

After breaking him out of hospital, the trio must avoid road blocks, spot traitors and even mend a punctured tyre as they attempt to get the monarch to a remote airbase and freedom. But Archer keeps wondering: is he walking into a trap?

Is he just a pawn in a private battle between dastardly Nazis Huth and Kellerman?

Meanwhile, Barbara languishes in German custody. The finale motors along at a right pace and you’re unlikely to guess which way the labyrinthine plot will take you.