Único testigo was released in the year 1985。Único testigo is also called as Witness, A Testemunha, A Tanu, Called Home, Testigo en peligro, Peter Weirin todistaja, Swiadek, Témoin sous surveilla, Ed, Einzige Zeuge。
Samuel Lap is a young Amish boy who witnesses a murder in Philadelphia while traveling with his mother Rachel. A good cop named John Book must go with them into hiding when the killers come after them. All three retreat to Amish country and Book has to adjust to the new life style, and his feelings for the boy's mother. Of course the killers are still on their trail.