Three Idiots and a Foolish Man

This series is Alternate Universe Theory, where one decision may lead to different situations in life.
Kumar's story starts with him being in Bombay in the year 1979. His studies, his love life, his romantic escapades, his disappointments constitutes the story.
In Three Idiots and a Wise man Kumar forgets his girlfriend of two years when she was taken away from him.
This story shows what happens when instead of forgetting her, elopes with her.
In this story he wants to show how easy to be a God-man. All one need is some ingenuity and correct circumstances. It is very easy to fool people who are need of something in believing.
There are some incidents that are puzzling to him. A girl appears in front of him and then disappears when she gives birth to a baby. Who is she and what is her problem. This part has a link to the next in the series Innocent Man.
These incidents relate to a science fiction theory, what is that theory, why they are happening in Kumar's life. to know more you have to read next book too.