A half-hour outside of Washington, DC, there’s a six-bedroom townhouse with a white portico. It was the house of Jane Kambalame, a diplomat in the United States from Malawi. Her job was to advocate for Malawian citizens. But there was one Malawian who didn’t get Kambalame’s help: Kambalame’s maid, Fainess Lipenga. For three years, Lipenga was…