Penny was almost 29 when she was trafficked from Rwanda to the UK, tricked into believing she could start a new life. Instead, she ended up trapped in a small flat in south-west London.
She had unwittingly stepped into a trap laid by a trafficker, becoming a commodity in what campaigners say is the world's fastest growing illegal trade - in people.
Yet when Penny agreed to meet the agent, introduced to her by a friend, she was unaware that human trafficking even existed.
"I didn't think about the consequences. I just took the opportunity to get out of the country," Penny said. Which countries are people trafficked from? "I had never heard what trafficking was all about until I was here. I didn't know anything about it at all."
Penny's story is just one of many that remain hidden. The UN estimates that some 2.5 million people are in forced labour at an
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