From an anonymous office in a New Delhi mall, matrimonial detective Bhavna Paliwal runs the rule over prospective husbands and wives — a booming industry in India, where younger generations are increasingly choosing love matches over arranged marriage.

The tradition of partners being carefully selected by the two families remains hugely popular, but in a country where social customs are changing rapidly, more and more couples are making their own matches.

So for some families, the first step when young lovers want to get married is not to call a priest or party planner but a sleuth like Paliwal with high-tech spy tools to investigate the prospective partner.