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Series 1: Episode 6

Rick arrives home and panics when Helen is nowhere to be found. The search for Helen begins, with the clock ticking and fear gripping the team. Ffion follows her gut, back to the bunkers near Cleddau woods, where she’s shocked to discover a man she knows, but there's still no sign of Helen. Rick is convinced his wife has been killed until he follows his own intuition, with devastating consequences.

Source: BBC 4