Susan is proof that any parent can suffer the horror of seeing their daughter become a victim of sex trafficking.
She and her husband are both successful professionals - she is a senior manager in the NHS, he is a social worker.
Their daughter Rachel was a happy 12-year-old who enjoyed pony riding.
But all that changed when she became the target of a group of men.
"We call it our three years of hell," said Susan.
"Every night we thought she was going to turn up dead. At times, we really didn't think we would get her back."
'Angry and aggressive'
Susan says her daughter's school - and others in the same city - were targeted by men who waited outside the gates.
"The girls were attracted to them and genuinely thought they were boyfriends.
"She told me she was "chilling". I later found out she'd been drinking with these men and they'd been having sex with her""My daughter had been bullied a bit at school. I think she felt she'd got some kudos having a boyfriend."
Soon after meeting her "boyfriend", Rachel started going missing for long periods, sometimes overnight.
"Every time we tried to question her about it she got angry and aggressive.
"She told me she was "chilling". I later found out she'd been drinking with these men and they'd been having sex with her.
"One time she was away for a week - kept in a flat.
"On another occasion, she came in at six o'clock in the morning and I asked her where she'd been and she swore at me. I shook her and slapped her round the face.
"It was the only time I ever showed her any physical violence but I was so angry at her and also so relieved that she was alive.
"I would lie awake at night and a car horn would toot outside at one in the morning and she would just go. One time, another girl actually called for her at midnight while the men waited in the car outside."
'Sickened'
Susan and her husband tried to follow their daughter to find out where the men were taking her. Their home was even vandalised when they got too close.
"I spent many nights at the top of the road freezing, waiting for these men to drop her off to see if I could get a registration number.
"It sickened me to think that these men were having sex with her," she said.
On one occasion Susan did track her daughter down to a flat, but she feels the law let her down.
"They'll use language they wouldn't normally use, maybe dress provocatively. They'll probably have gifts that you know you haven't bought them""The police came and got her [and another girl] out, but the girls said to the police they were there of their own volition, so the police wouldn't do anything."
Susan eventually got her daughter back after three years, helped by a social worker who kept contact with Rachel even when she would not speak to her parents.
"The men told her that we didn't love her, that she was really adopted. It was all lies.
"To get her out of it, no matter what we felt about what was happening, we just kept telling her that we loved her, that we wanted her to be safe."
'Cut themselves off'
Susan feels she missed the early signs that her daughter was being groomed.
"It's over and above normal teenage behaviour. They'll use language they wouldn't normally use, maybe dress provocatively. They'll probably have gifts that you know you haven't bought them.
"They sort of cut themselves off from family life. I know some of this sounds like normal teenage behaviour, but it's much more acute. I've learned this can happen to anybody.
"People who want to groom children will target them anywhere. All they've got to see is one chink and they will exploit it."
Rachel is now going to college and trying to get on with her life.
She says she realises that the "normality" she knew when she was 13 - of having a much older boyfriend, and being expected to have sex with his "friends" - was not normal at all.
Names of those involved have been changed to protect their identity.
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