How I Met Myself : Cambridge Reader Level 3

One icy winter's evening in Budapest, John Taylor is on his way home from the office when a man runs into him and knocks him over. The man turns to say sorry and John is amazed at what he sees: the man is John's double. The double rushes away but leaves no footprints in the snow. Over the next year it becomes clear to John that the meeting was no accident and that his double has a very important message to give him.