A very complete plot outline appears at https://en.wikipedia.org/wiki/Badlapur_%28film%29
I'll quote also from that page:
"Raja Sen from Rediff.com rated it 4 out of 5 and said "Badlapur is a dark, unflinching, fantastic film." Sudhish Kamath from The Hindu wrote that the film was "darkly ambitious and very well made." Rachit Gupta from Filmfare stated that it had "exhilarating performances, stellar storytelling."
"Saibal Chatterjee of NDTV noted the pervasive contemptful treatment of women in the film, writing, "If one can ignore the overt misogyny on show all through the film, Badlapur throws up enough surprises to hold the viewer's interest right until the bitter end."
"Mohar Basu of The Times of India rated Badlapur 4 out of 5. Shubhra Gupta of The Indian Express rated the movie 2.5 stars out of 5, describing it as riveting, but also noting that the film "comes off too contrived in many places, and leaves us hanging in others." Rajeev Masand of CNN-IBN rated it 3.5 out of 5 and wrote: "The pace slackens post-intermission, plot contrivances are many, and you might say the film is misogynistic in its treatment of women ... [However], the film keeps you on your toes, curious to see where its twists and turns will lead.""