When headmaster Michael Polly (David Morrissey) comes home to find his wife Sarah missing, he reports it to Detective Sergeant Annie Cassidy (Eve Myles). But his chilling calm sets alarm bells ringing. As disturbing evidence surfaces and suspicion spreads through the school gates, Annie digs deeper - clashing with her superiors and risking her career. Secrets, lies and a shocking new suspect push the case to breaking point. With pressure mounting and trust shattered, Annie must follow her instincts to uncover a devastating truth before everything falls apart.
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