"hidden" Episode #3.5(2021) -

The interview with former farm worker Dafydd O’Connell provides the missing link . He reveals a long-buried secret about a past arson and the smell of a Jerry can , finally connecting the murder of Father McEwan to the historical tragedy surrounding the Williams family .

Cadi is trapped in a holding pattern, torn between her flourishing relationship with pathologist Rachel West and an enticing job offer in Liverpool . "Hidden" Episode #3.5(2021)

Siôn is not a typical, mustache-twirling villain . He is a man utterly destroyed by the burden of being the sole protector of his brother Glyn, who has Down's syndrome, after being repeatedly failed by social systems . The interview with former farm worker Dafydd O’Connell

While the criminal net tightens, the episode deeply examines the emotional isolation of its hero, DCI Cadi John (played with fantastic groundedness by Sian Reese-Williams) : Siôn is not a typical, mustache-twirling villain