When the Mt Thomas High School principal is attacked, Tom and the Heelers suspect exam theft is the cause. Until, that is, they begin probing into the dysfunctional family of the principal. Meanwhile, Ben earnestly awaits the promotion to Sergeant that he has been seeking for four years. Last time he wanted it, it was snatched up by Tess. He's so close now, but Inspector Falcon-Price has other plans... And Susie's marriage troubles escalate; while Tom finds more trials as Daniel finishes school.