SOLVED. YA novel search

[Michael]

YA novel. contemporary. Main character is a High school girl. Her school is pranked. She spots a strange boy in the crowd of students when the school is evacuated. She spots the boy outside her house one night. She goes to an underground party and is drugged. She wakes up a captive of a group of wayward kids. The kids are protesting a corporation, who's CEO is the father of the captive girl. The girl becomes emotionally attached to her captive.