Conversation so far:
Did Devika Rani elope?
Najm-ul-Hassan was also Devika's co-star in the studio's next venture, Jeevan Naiya. During the shooting schedule of Jeevan Naiya, Devika eloped with Hassan.
When did Devika Rani's elopement occur?
Jeevan Naiya is a 1936 Hindi film directed by Franz Osten, and produced by Himanshu Rai for his studio Bombay Talkies.

Question: What movie were they working on together?
Self-contained rewrite: What movie were Najm-ul-Hassan and Devika Rani working on together?