Dev chose Guru Dutt as director for the crime thriller, "Baazi" (1951). The film, starring Dev Anand, Geeta Bali and Kalpana Kartik was a trendsetter, regarded as the forerunner of the spate of urban crime films that followed in Bollywood in the 1950s. The film "Baazi" saw the debut of Kalpana Kartik (aka Mona Singha) as the lead female actress and Guru Dutt as a director. The collaboration was a success at the box office and the duo of Dev Anand and Kalpana Kartik were offered many films to star in together. They signed all the film offers and subsequently the movies "Aandhiyan" (1952), "Taxi Driver" (1954), "House No. 44" (1955) and "Nau Do Gyarah" (1957) went on to become big hits too. During the making of the film "Taxi Driver", the couple fell in love and Dev proposed marriage to his heroine Kalpana. In 1954, "Taxi Driver" was declared a hit and the two decided to marry in a quiet ceremony. The couple had a son, Suneil Anand in 1956 and later a daughter, Devina, was born. After her marriage, Kalpana decided not to pursue her acting career further. "Nau Do Gyarah" was the couple's last movie together.