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When an impassive headmaster reports that his wife has gone missing to the police, her disappearance soon takes a sinister turn.

Annie is struck by Michael's strangeness in the wake of an awful discovery, but she also sees his vulnerability in the midst of the grimmest of tasks.

Michael expresses his discontent with the investigation during questioning, and Annie alights on a new suspect.

Annie and her colleagues begin to see things in a new light as fresh information continues to emerge.

Michael is increasingly isolated as the investigation broadens.

The investigation hurtles towards a shattering conclusion.