Kaala Naag  (Hindi, Paperback, Pathak Surender Mohan)

He was a police officer! The head of a police station, he was after the life of his sub-inspector because of a personal conflict between them. Hot-headed and quarrelsome, he called himself a black serpent (kaala naag), who had the most lethal bite, killing a man in just one strike. And then he struck. The kind of thriller that will send a shudder down your spine and make your skin crawl as if a snake was uncoiling before your eyes. Unputdownable.