Half girlfriend by chetan bhagat is one of the best selling book of chetan bhagat. I personally own one of this book and the story of half girlfriend is good. like a guy falls in love with a girl from the city who is modern but the guy is from samll village who has come to delhi for studying and then the story of thier life starts and in the end they both get married and have a kid and live life happily there are various ups and downs in their life but they tackle it and live together forever. the book is readable and it can be finished reading in few days.