Chandan is rushing to his home-town from Bombay to be beside his long-ailing father, Lala Baijnath, whose illness has relapsed. Chandan’s college friend, Prakash (Manoj Kumar) accompanies him. Reaching the outskirts of the town, Prakash is shocked to learn that the mansion he is visiting is haunted and Lala Bahinath, is suspected by the town of having murdered a beautiful young woman on the day of a full moon.
It is believed that the spirit of the murdered woman, Rani haunts the mansion to this day. Prakash is curious and intrigued. Prakash meets Chandan’s sisters, Jyoti and Nandini but before a love triangle acquires any dimensions, the unexpected happens. Prakash, in the dead of the night, begins to hear a woman’s voice singing and soon Prakash is captivated by the charms of an elusive spirit, Rani. With Lalaji’s nurse murdered and every relative wanting a stake in the property, things take a dark turn where no one can be trusted and everyone is a suspect.
Curious Prakash determined to resolve the mystery of the mansion and start an investigation on its own. He persuades Chandan to show him the closed quarters of Rani, which are forbidden to enter by any one after her death twelve years ago, by orders of Lala Baijnath. After examining the room they returned. Prakash continue to hear mysterious sounds in night from his bedroom. He follows an woman in white clothing to no avail. Meanwhile Chandan and Prakash camp mates visits the mansion on earlier invitation by Chandan. One of girls dares Praksh to bring out her Sandal from nearby well after hearing his swimming skills from others, to add further excitement Nandini dumps her expensive bangles to well and challenges Prakash to bring it out and keep the same as reward.
Without wasting any time Prakash jumps into the well, and disappeared from sight to dismay of onlookers. When he reappears after some time he holds the corpse of murdered nurse. Meanwhile mysterious woman in white clothing continue to bother Prakash, he felt like nervous breakdown. As the time passes the day of full moon arrives again, warned by gardener and family doctor all are asked to stay vigilant to face untowardly incident. In midnight, a silhouette with a knife in her hand approaches sleeping Lala Baijnath and stabs his blanket covered body.
In meantime alert Prakash catches the murderer red handed, who is non other than Nandini. She tried to put blame the on Prakash but Lala Baijnath, as put on sleep somewhere near unusual to deceit the murderer recovers from his paralysis due to further shock, reveals to all that Nandini was daughter of Rani and suffering from same mental disease as her mother, an illness which attacks occurs on full moon days which costs her life twelve years ago as she fallen from upstairs,. Lala reveals further that on earlier attack on him by her, she accidentally killed nurse later pushing nurse to well from window and causing paralysis to him by shock. As everyone was in state of shock, doctor ensures that she will be treated to his full capacity as Nandini sings the same haunted song and marches ahead towards mansions balcony.