They hope to earn enough money to help support their families back at home. But once they arrive in Singapore, they are at the mercy of their employers. Often, their passports are taken away from them. There are more than 200,000 such domestic servants in Singapore, and for many of them their workplace is little more than a prison. They’re expected to be available 24 hours a day, 7 days a week, and never get a day off, let alone a holiday.