Sadhana Shivdasani, known mononymously as Sadhana, was an Indian actress who worked in Hindi films. Regarded as one of the finest actresses of Indian cinema, Sadhana was noted for her exquisite beauty and trend-setting fashion statements. She was popularly known as "The Mystery Girl" for her stint as the "mystery girl" in the suspense thriller trilogy films directed by Raj Khosla during the mid 1960s.

Raj Khosla was one of the top directors, producers and screenwriters in Hindi film industry from the 1950s to the 1980s. He was known for bringing in "neo-noir" and style in Indian cinema, and also as a "women's director" because he showcased actresses at their best. He has given many successful films with Dev Anand. Starting his career under Guru Dutt, he went on to make hit films like, C.I.D. (1956), Woh Kaun Thi? (1964), Mera Saaya (1966), Mera Gaon Mera Desh (1971), Dostana (1980) and Main Tulsi Tere Aangan Ki (1978), the last of which won the Filmfare Award for Best Film. His early background in classical music ensured that most of his films excelled in music.