When violence breaks out in the streets innocent bystanders are often drawn into the melee. The same thing can happen in the covert world of espionage. Julie Davidge, whose brother is serving a twelve-year sentence for spying in an iron curtain country, receives a postcard from a seemingly impossible source - and suddenly she finds herself enmeshed in an intrigue, in which she herself is revealed terrifyingly to be playing a major part. The action moves from the overt world of an everyday working London life to Brittany, and back to a London now grown very dangerous for Julie and her friends.