itting in the living room of a Salvation Army safe house in Cambridgeshire, Rose looks like a regular 20-something. 

Her clothes and friendly smile tell little of the four-year ordeal that brought her from Nigeria to this refuge. She says her dreams of a new life in Britain became a nightmare of punishing work, physical assault and rape. She is nervous to tell her story but wants people to understand the reality of modern slavery in the UK - a crime hiding in plain sight.

According to BBC, Rose left Nigeria full of optimism for all that Britain has to offer.

The first of five children, her father had been a trader until he lost his shop, which meant the family could not pay for her to continue her education.

So when a family friend from church told her of an opportunity to become a nanny for a wealthy UK couple, who would sponsor her studies, she jumped at the chance.

"I felt so exhausted... so empty. This was not what they promised me," she says.

Rose says the gruelling work pattern continued for a year, with no wages and no sign of her starting her studies.

"That's when it dawned on me - 'Oh, these people actually bring me here to work for them as a slave.'"

At the time she could not call her family because of the home's CCTV, so she called when she took their little girl to the park.

Even then, she did not want to tell the truth.

"When I call [my mother] and she asked me, 'How are you doing?' - I would lie to her. 'I'm fine, I'm OK, they are planning to send me to school.'"

She says the couple would shout at her, calling her "stupid" and "useless", which made her "very scared".

On one occasion, she says the wife slapped her for a perceived act of disobedience.

'My life was hell'

The Covid-19 pandemic made matters worse.

All the other staff left the restaurant, leaving her alone cooking and cleaning all night.

The wife also returned to Nigeria, which meant Rose had sole care of her daughter.

Describing her routine, in which she would get only a few hours of sleep each day, Rose breaks down in tears.

She says the situation left her trapped and exposed to a new form of exploitation.

"The man abused me in so many ways. Sexually, emotionally, physically.

"He raped me countless times because I can't talk to anybody.

"My life was hell."

Her escape came when she confided in a friend at the restaurant, who over months persuaded her to go to the police.

At first she was very reluctant because the couple made her fear the authorities. It has taken time to recover.

"I didn't have that confidence anymore because I didn't see myself as good enough, I didn't see myself as a human being."

It is no surprise to Rose that the people she worked with, and the customers she served, had no idea of her ordeal.

"I see people every day, they see me laugh and smile. Inside I'm crying."

Rose's story is all too familiar to the Salvation Army - the charity that has held the government contract for supporting victims of modern slavery since 2011.

Offering economically disadvantaged people a dream job or educational opportunity is a common method used to entrap victims, who are told they owe a debt to their captors and must work to pay it off.

Territorial director for anti-trafficking, Kathy Betteridge, says despite increased awareness, there are still too many falling through the net.

"For every one person we've rescued, there will be seven others still in captivity," she says.

The charity calculates it has supported 22,000 survivors and the numbers are growing year on year.

Last year across England and Wales, 3,533 people were rescued and supported, while in the East of England the charity helped 187 people - an increase of 64 people on the previous year.

"A human body is such a lucrative commodity. It can be sold and resold. Somebody comes in and then they are moved around the country for gain of the criminals," says Ms Betteridge.

'We give them their life back'

Forced labour is common in the construction, agriculture, hospitality, domestic and sex industries, she says, but there is "growing concern" about the care sector.

"People who are caught up in modern slavery aren't bound in chains as maybe some think. We could be sitting next to somebody... served by somebody who is in modern slavery."

Signs to look out for and report include people who are fearful or withdrawn, those who have marks on their bodies or appear to be controlled by someone who talks on their behalf.

Sadia Wain, who oversees the charity's accommodation and support services, says when clients first enter a safe house "you can read fear on their faces", and her teams work to build trust.

The charity supports victims through the criminal justice process and makes sure they have access to English classes and education.

"They were given a promise and when they came over here with that promise it turned into a nightmare, and we turn that nightmare back into a dream. We give them their life back," Ms Wain says.

The Salvation Army says the couple who allegedly forced Rose to work for them were arrested and interviewed by police. No charges have been brought and inquiries continue.

Rose has received an initial decision from the Home Office to say there are "reasonable grounds" to say she is a victim of modern slavery but is awaiting a "conclusive grounds" determination, which can take many months.