Harry Bates' 1940 novella, Farewell to the Master, is far from the 1951 and 2008 The Day the Earth Stood Still movies. F to the M is set in a 1940's future filled with hovercraft, ray guns, telescreens, and interplanetary travel. The story is told through a "picture reporter." Klaatu plays a minimal role. There's no female character, or child. Gnut, the supposed interdimensional traveler, is the central point of interest. Much time is spent pondering Gnut's intentions because the concept of video surveillance was apparently not yet common place in 1940.
The 1940 story has a would-be assassin of the devil. The 1951 film stars an alien who believes in a censor-inserted "almighty spirit." The 2008 version alludes to an ark. All three fantasize about how the U.S. would respond to an extraterrestrial visitor whose technology renders it invincible to humanity. Each one ends differently. Farewell to the Master features the best finish. It stays pure to its commentary about people's rush to judgement whereas the first motion picture tries to inject some creepy morale. The conclusion to the one now playing in theaters is simply incomprehensible. You can buy the audiobook, and rent the video
for less than the price of a movie ticket.