Aasmaan is a thriller mystery drama. The movie revolves around a young army officer named Captain Kumar (Rajiv Kapoor), who is far away from his hometown serving on the border. Things take a turn, when his look-alike, Chandan, goes to his house and his mother (Mala Sinha), welcomes the imposter. However, his pet dog senses something suspicious and even Kumar’s sweetheart feels that he has changed, but the mother is adamant to believe that it is not her son. What are the motives of this imposter? Will Kumar be able to protect his family from the evil motives of this unusual man?