Two female social workers from I.J.M. immediately began comforting Chutki, who police said was about 15 and looked terrified. They explained that this was a police operation to rescue her, and they helped her put on a robe for modesty’s sake.

Then another of the girls in the room asked if she could be rescued — but a few days later. She explained that if she left now, the brothel-owners would blame her for the raid and possibly harm her grandmother, whose address they knew.

We told the girl that this chance might not come again. She dissolved into tears, wavered and then decided to come out. Then a third said that she wanted to escape as well.

The girls tipped off the police that the brothel-owner was in another building, arranging to sell a new girl named Raya for the very first time, either that evening or the next night. The police hurried off and returned with Raya, a wide-eyed girl of about 10 years.

It seemed that the brothel had purchased Raya just a week earlier, after her own brother-in-law tricked her and trafficked her. If the raid had been delayed by a few hours, she might have faced the first of many rapes.

With Raya was a 5-year-old girl who seemed to have been abandoned. Perhaps the brothel-owners were grooming her for sale in a few more years. So we emerged from the brothel with five lives that had just been transformed.

Equally important, one pimp had been arrested and arrest warrants had been issued for two more. There are no quick fixes to human trafficking, but experience in several countries suggests that prosecuting pimps and brothel-owners makes a difference. A study in Cebu, Philippines, found that helping police and courts target child prostitution resulted in 87 arrests over four years — and a 79 percent reduction in the number of children in the sex trade.

We drove the five girls to a police station to fill out paperwork so that they could move into shelters and receive schooling or vocational training. Raya, the 10-year-old who otherwise at that moment might have been enduring her first rape, was giggly and carefree as she pretended to drive the car. She behaved like a silly little girl — which was thrilling.