When you open up, who will you let in?When Alex Morris loses her fiance in dreadful circumstances, she moves from London to Edinburgh to make a break with the past. Alex takes a job at a Pupil Referral Unit, which accepts the students excluded from other schools in the city. These are troubled, difficult kids and Alex is terrified of what she's taken on.There is one class - a group of five teenagers - who intimidate Alex and every other teacher on The Unit. But with the help of the Greek tragedies she teaches, Alex gradually develops a rapport with them. Finding them enthralled by tales of cruel fate and bloody revenge, she even begins to worry that they are taking her lessons to heart, and that a whole new tragedy is being performed, right in front of her.