So is there a common thread of similarity, something that all of the 50 films featured in the book have in common?
"All of them are stand-out films: They did something, caught a moment, launched an actor or a director who went on to be super successful, or turned the industry in a particular direction," said Gupta.
In "50 Films That Changed Bollywood", she looks at the modern classics that have redefined Hindi cinema -- from "DDLJ" and "Rangeela" to "Satya" and "Dev D" to "Queen" and "Bajrangi Bhaijaan".