In a major investigation, Natalia Antelava reports on the abduction of tens of thousands of young girls in India for forced marriages. Thousands more are sold as prostitutes and domestic servants. She follows the route of the traffickers, who take girls from destitute households in places like West Bengal to wealthier areas in Northern states, where a shortage of women is blamed by many on sex-selective abortions. It's a problem the United Nations describes as of 'genocidal proportions'. Natalia joins campaigners and police fighting the trade and hears the stories of the trafficked girls and from a trafficker himself. Producer: Natalie Morton.