Ratnadeep revolves around a person who was fed up with his job and to get out of that situation, he applied for two months leave. The story follows when on the last day of his job he found the dead body of a man belonged to very rich family and the body resembled him, which brought new adventures in his life.
Rajesh Khanna and Sharmila Tagore play the roles of estranged lovers and are busy sacrificing for each other.
Heera has two passions in his life, namely his love for Reema, an air-hostess, and photography. When Reema passes away during an airplane accident, Heera is left with only passion in life - photography. During one of his photographic sessions with Raja Saab, a priceless diamond is stolen by Panna, and is hidden in Heera's car. When Heera comes to know about this theft and that he is in possession of stolen property, he decides to turn Panna in to the police, and that's when he comes to know that Panna is Reema's younger sister.