Sally was hurriedly walking through the deserted and gloomy streets of Stockholm at night with a push-button phone that illuminated her path when rapid footsteps began to be heard behind her. Sally quickened her pace, visibly nervous and trying not to show fear, and entered an alley. Going around the corner of the house in the vain hope of knocking the pursuer off the trail, she found herself in front of a lattice fence, thereby hitting a dead end. Meanwhile, someone was getting closer...