The two 90-minute dramas will be adapted from Alan Furst’s novels by TV writers Dick Clement and Ian La Frenais (The Likely Lads).

Set in Poland, Paris, London and Berlin in the years leading up to the Second World War, The Spies of Warsaw follows French and German intelligence operatives locked in a life-and-death struggle on the espionage battlefield.

Tennant will play handsome aristocrat Colonel Jean-Francois Mercier, a decorated war hero of the 1914 war who is drawn into a world of abduction, betrayal and intrigue in the diplomatic salons and back alleys of Warsaw. Mercier finds himself in a passionate love affair with Anna (Montgomery), a Parisian lawyer for the League of Nations.

Richard Klein, Controller of BBC Four, commented: “Spies Of Warsaw is Alan Furst at his best – a tense, passionate and sexy love story set against the increasingly strident clang of coming war.

“I think David Tennant playing Mercier and Janet Montgomery as Anna is such an exciting way to explore Furst’s hugely convincing central characters, and I am delighted that Ian and Dick have produced such an enthralling script.”

The cast also includes Burn Gorman (Torchwood) as Jourdain, Ann Eleonora Jørgensen (The Killing) as Olga Musser, Anton Lesser (The Hour) as Doctor Lapp, and Richard Lintern (White Heat) as Colonel Lessard.

Filming will begin on location in Poland next month.

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Watch a clip of David Tennant in United…