Spring of 1944. Rosie Ewing, a 'pianist' (radio operator) in Special Operations Executive, is returning to German-occupied France, carrying a radio, half a million francs, a pistol and two cyanide capsules. Her destination is Finistere, in north-west Brittany. D-Day is not far ahead, and the Maquis is still dangerously under-armed; part of her brief is to organise immediate para-drops of weaponry. Also there's a chateau that's used as a rest-home for U-boat crews and where naval top brass periodically foregather; Bomber Command needs only a date and a few days notice. Rosie knows that the man who'll be meeting her on the ground tonight may be a traitor, that a frighteningly large number of agents have been arrested recently, and that the likely end of the road for women agents is Ravensbruck - l'enfer des femmes, the Resistance calls it.

Nothing like a safe bet. But - hold tight...