I understand the urge for free content. Hindi pulp fiction is historically under-digitized. However, Surender Mohan Pathak (who is still alive as of this writing) has often spoken about how piracy hurts the revival of Hindi thrillers.
The phrase refers to a popular Hindi fictional work, often identified as a romance or adult-themed novel. This title is also famously associated with a 1956 film, Rangeen Raaten rangeen raatein book pdf better