The crew of an international space mission are on the return leg from Mars to Earth when an explosion occurs on the craft Conestoga, shortly after a series of murders starts.
The final 15 minutes of the film was shown at a later date when the mystery was solved with only two countries provided winners with the correct answer.
Other cast members were reporters, wives and husbands, mission control staff and additional Russian characters.
It then asked the ultimate question – “Who Committed the Murders?” Readers who correctly guessed the answer had the opportunity to win a trip on the Orient Express however no entries received were actually correct so instead the closest answer to who the murderer was given a year's free subscription to the magazine.
[1] A novel also called "Murder In Space", published by Penguin, was produced around the same time; the last page of the book was an entry form for the competition to solve the mystery.