The treacherous deal!!!

Alan was walking through the forest when he heard some light footsteps. Alan looked around, turned around but he saw no one. He ignored his feeling and then again started having a walk while lighting a cigarette but he could still feel someone following him. Alan walked faster and then hides behind a huge tree. He waited for someone to come out who has been following him but nobody came. He peaked for a while but soon he thought that he might be having a wrong idea. He was about to come out when he saw a young teenager girl walking carefully at some distance from Alan. She was searching someone and trying to be discreet about it. She must be the one who had been following him. But who was she?