Gary Fenn leads the life of a successful advertising man in London until he meets the mysterious Marla Kugash by chance. What initially begins as a harmless flirtation quickly turns out to be a deadly affair: Marla has unintentionally picked up clues about a planned assassination attempt, and suddenly both are in the crosshairs of unscrupulous conspirators. While Gary tries to get to the bottom of the background, he himself comes under suspicion of murder and has to escape not only the perpetrators, but also the police.