Winter in Madrid.

1940: The Spanish Civil War is over, and Madrid lies ruined, while the Germans continue their relentless march through Europe. And as Britain stands alone, General Franco considers whether to abandon neutrality and enter the war. Into this uncertain world comes Harry Brett: ex-public schoolboy, traumatised veteran of Dunkirk and, now, reluctant spy for the British Secret Service. Sent to gain the confidence of Sandy Forsyth, an old schoolfriend turned shady Madrid businessman, he finds himself involved in a dangerous game - and surrounded by memories. Meanwhile Sandy's girlfriend, ex-Red Cross nurse Barbara Clare, is engaged on a secret mission of her own - to find her former lover...