An alien crashes on Earth and hides in a remote Colorado mountain town. After assuming the identity of the town doctor, Harry Vanderspeigle, his nefarious mission to kill all humans is threatened when he realizes one of the townspeople, a 9-year-old boy, can see his true alien form. Harry starts off living a simple life, but things get a bit rocky when he's roped into solving a local murder and realizes he needs to assimilate into his new world and slowly begins to wrestle with the moral dilemma of his secret mission on Earth.