When three British officers went to Tbilisi in Georgia to set up a British military mission in 1941, they caused ripples of excitement - and not just in the Soviet Secret Service. The officers also lifted the gloom of the early war years for three young Georgian women. Faynia Williams revisits Georgia and Moscow to tell their fascinating stories, interwoven with the poignant letters of separation and love, and memories of those who played a part in this romantic web.