Administrative assistant Shoba Devi, 27, got suspicious when her Filipino maid of a few months started chatting on the phone late into the night.
Miss Devi, who is single and lives with her father who is in his 60s, said: "I didn't know if she had a boyfriend and I was worried for our safety if she brought her boyfriend home."
In February, she hired private investigator James Loh, who runs International Investigators, to keep tabs on her maid during her days off.
He discovered that the maid - in her 20s and married - had a Bangladeshi boyfriend and, on her days off, they would meet to eat, shop and check into a budget hotel.
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