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1995. A bomb. A death. A conviction. Now Rhys Owen is back in Llanemlyn following a 20 year prison sentence for the murder of his cousin Llyr - older, quieter, but still carrying secrets. As protests erupt over a new reservoir expansion, student journalist Caryl Huws starts asking the wrong questions.

As Caryl digs deeper, she encounters Mabli, a young activist protesting reservoir expansion. Eve finds herself increasingly cornered as Caryl's investigation progresses. Rhys's quest for answers leads him to a confrontation with Eve, triggering revelations that threaten to unravel the town's long-held truths.

Caryl attempts to return the documents related to her investigation to Gillian, admitting she feels like she's been twisting the facts and is not the right person to tell the story. Gillian encourages her not to give up so easily.

Caryl relentlessly pursues the truth, interrogating Eve, Rhys, and Robert, seeking to uncover their involvement in the tragic event. Family dynamics are muddied by Mabli's secret paternity test, a revelation that threatens to unravel the family. Eve's desperation to protect her past results in dire consequences.

The community grieves for one of its stalwarts. Eve is tormented by guilt, while Mabli voices her criticism of reservoirs through a poignant poem at the funeral. Mabli joins forces with Hari to take a stand against the reservoir.

As Caryl pieces together the events surrounding Llyr's demise, Rhys confronts his father, Bryn, to uncover his connection to Llyr and the bombing. Hari makes the difficult decision to leave Llanemlyn, for a fresh start.