Shantaram (Shantaram #1) by Gregory David Roberts

Shantaram is narrated by Lin, an escaped convict with a false passport who flees maximum security prison in Australia for the teeming streets of a city where he can disappear.

Accompanied by his guide and faithful friend, Prabaker, the two enter Bombay's hidden society of beggars and gangsters, street walkers and holy men, soldiers and actors, and Indians and exiles from other countries, who seek in this remarkable place what they cannot find elsewhere.

As a hunted man without a home, family, or identity, Lin searches for love and meaning while running a clinic in one of the city's poorest slums, and serving his apprenticeship in the dark arts of the Bombay mafia. The search leads him to war, prison torture, murder, and a series of enigmatic and bloody betrayals. The keys to unlock the mysteries and intrigues that bind Lin are held by two people. The first is Khader Khan: mafia godfather, criminal-philosopher-saint, and mentor to Lin in the underworld of the Golden City. The second is Karla: elusive, dangerous, and beautiful, whose passions are driven by secrets that torment her and yet give her a terrible power.