Issued also in electronic formats.

When a group of teens are sent to a wilderness camp on an island to work through their problems, one of the girls vanishes, an ex-cop dies, and the radio has been disrupted, the kids choose to take matters into their own hands and find the executioner.

Eight teens are dropped off on a remote west-coast island for a week-long treatment program called INTRO (Into Nature to Renew Ourselves). Alice's police-officer mother believes Alice might have a substance-abuse problem; Caleb, who assaulted his abusive stepfather; they are joined by six other miscreants and three staff: a psychologist, a social worker and an ex-cop. On the first night, one of the girls disappears from her cabin. The adults seem oddly ineffectual in dealing with the crisis-- and then the ex-cop gets sick and dies. The radio has been sabotaged, and there is no way to call for help. When the social worker also becomes ill, the kids decide to take matters into their own hands and track down the killer.