Woh Kaun Thi?

• The project actually began years earlier as an unfinished Guru Dutt production called "Raaz." It was shelved mid-shoot, and Raj Khosla — Dutt's former assistant director — revived it from scratch with a new screenplay by Dhruva Chatterjee.
• The haunting theme song "Naina Barse Rim Jhim Rim Jhim" was actually composed by Madan Mohan back in 1952, over a decade before the film existed — no director had a scene that fit it until Raj Khosla found it perfect for this story.
• When the crew shot the "Naina Barse" sequence on location in Shimla, Lata Mangeshkar wasn't available to record in time, so Madan Mohan sang a guide vocal himself and Sadhana lip-synced to the composer's own voice on set; Lata's studio vocal was dubbed in afterward.
• Cinematographer K.H. Kapadia won the Filmfare Award for Best Cinematography (Black & White) for the film, which also picked up nominations for Best Actress (Sadhana) and Best Music Director (Madan Mohan).
• Producer N.N. Sippy was initially reluctant to fund location shooting; Raj Khosla talked him into sending the unit to Shimla specifically to capture the snow-laden atmosphere used in the film's climactic stretch.

The ghost is not a spirit but a manifestation of Dr. Anand's repressed guilt over a past lover, with the entire third act representing his subconscious attempting to sabotage his current marriage.

Sandhya's character is the actual antagonist, feigning hysteria to isolate her husband and gaslight him into insanity, using local folklore as a cover for her domestic terrorism.

The recurring motif of the locked room suggests the entire narrative occurs within a purgatorial state where Anand is forced to relive the moment of his lover's death until he accepts responsibility.

Dr. Anand's rainy-night pickup of a spectral hitchhiker spirals into a gothic nightmare where domestic bliss curdles into paranoia. The mysterious woman haunts his mansion, vanishing behind locked doors and materializing in mirrors, driving his new wife Sandhya to the brink of madness. Khosla weaponizes the fog-drenched Himalayas against rationality, trapping the protagonist in a loop of suspicion and supernatural dread. Is this a ghost story or a psychological unraveling? The film refuses easy answers, letting the shadows swallow logic whole as the past violently intrudes upon the present.