After the SRU discovers a high school's dark history, a student threatens to jump off the school's roof while another takes a hostage.

When a 911 operator gets a call from a young person who is constantly telephoning in false alarms, the operator tries to hang up but she hears a shot so the team is sent to check it out. When they arrive they find a woman shot, and the girl is not there. They also find several ids. When the woman wakes up she reveals that her daughter witnessed a crime a few years ago. So that the authorities can catch the criminals, they went into hiding.