The movie is a film about three couples and a keen observation on the modern day marriage.
Characters:
Rajat Kapoor as Rahul is a perfect family and an ad film maker. Been married Iravati Harshe as Mitali for eight years with a beautiful daughter with an encounter with one mysterious lady changes a lot of things he formerly assumed about himself and his happily married life.
Iravati Harshe as Mitali is an intelligent modern woman and a sculptor by profession, but decided give up her career after marriage. At the party something happens, the night before, unfolds many truths of her life.
Dalip Tahil as Saxena is a middle aged famous writer with lots of fame and success people say that he married for money and he is considered life of every party.
Navneet Nishan as Jolly is Saxena's wife who is frivolous, flighty and quite loud but an endearing person by nature despite she fails when she wants to help the people around her.
Anu Menon as Nandini and Vinay Pathak as Amit are married. Nandini catches amit watching porn and gives her an indication of a failure in their relationship
Neha Dhupia as Sophia is an aspiring actor who grabs everybody's attention but remains distant. Her character is confusing, that slowly unfolds with interactions with interesting men she meets.
Story
Rahul wakes up with a bad hangover after a party the night before. There he had met a sexy young woman Sophia. They got drunk and there were sparks flying. But Rahul doesn't remember what happened after that. Did they...go all the way? His wife, Mitali, is in a particularly bad mood and Rahul suspects that she might know about his little escapade last night. Rahul starts chasing his night - trying to retrieve it - trying to find out what really happened. His friends Saxena and Amit are going through their own marital crisis of sorts. Driven to his wits end, he realizes that he must seek Sophia out to restore his sanity.
The story is about marriage and the three couples who are finding their relation in trouble and to restore the relation, they get out in search of the girl Sophia.
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http://movies.iexplorehere.com/review/793/Raat-Gayi-Baat-Gayi.html