Meet Vish Puri, India's most private investigator. Portly, persistent and unmistakably Punjabi, he cuts a determined swathe through modern India's swindlers, cheats and murderers.

In hot and dusty Delhi, where call centres and malls are changing the ancient fabric of Indian life, Puri's main work comes from screening prospective marriage partners, a job once the preserve of aunties and family priests.

But when an honest public litigator is accused of murdering his maidservant, it takes all of Puri's resources to investigate. How will he trace the fate of the girl, known only as Mary, in a population of more than one billion? Who is taking pot shots at him and his prize chilli plants? And why is his widowed 'Mummy-ji' attempting to play sleuth when everyone knows Mummies are not detectives?

With his team of undercover operatives – Tubelight, Flush and Facecream – Puri ingeniously combines modern techniques with principles of detection established in India more than two thousand years ago — long before 'that Johnny-come-lately' Sherlock Holmes donned his Deerstalker.

The search for Mary takes him to the desert oasis of Jaipur and the remote mines of Jharkhand. From his well-heeled Gymkhana Club to the slums where the servant classes live, Puri's adventures reveal modern India in all its seething complexity.