Read somewhere else on the board about a "kidnap service" etc.
So I was thinking, along the same lines, how about a story where a girl signs up for such a service, and they tell her she'll be kidnapped any time in the next week, but she doesn't know (to make the experience more real)
However, some REAL kidnappers find out, and decide to kidnap her for ransom
So, when she is kidnapped by masked men, and tied up etc, she thinks it's part of the service....