What Next?

When a small girl from a small town got kidnapped, they took her to an abandoned roller coaster park where she was held for a long while until her parents got her. But when they got her, she weren't normal. She was broken down. Her parents first question ever since they got her was:
"What Next?"

After that day she walked away from home and met a new friend. They both were kidnapped. They later got married and became kidnappers themselves.
They used the same abandoned roller coaster park, that she was held in, to keep their victims in.