Horror. A couple driving with their son are involved in a horrific accident caused by a hitchhiker they have given a lift to, who attacks the husband, Martin, catching him in the throat with a long nail on one of his hands. Much to the horror of Janet, his wife, Martin begins to change, and grows a long, hooked nail on his right hand. Janet visits a doctor who explains that there may be a connection to `doppelgangers' - beings from another plane who take the place of living humans as exact replicas.
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