From Saturday 1 March at 9pm, BBC Four will be broadcasting The One That Got Away – the Welsh crime show set in Pembrokeshire starring Elen Rhys and Richard Harrington. It’s a St David’s Day treat for anyone interested in Welsh crime fiction outside Wales. However, if you live in the BBC Wales region, you’ll be able to watch it starting at 9:20pm on Tuesday 25 February.

If you’ve been following our coverage of Celtic crime shows here on Crime Fiction Lover, this one might already be familiar to you. In October 2024, the programme aired as Cleddau on S4C and on the BBC iPlayer in the Welsh language. Now, rebadged as The One That Got Away, viewers across the UK will be able to watch it on broadcast TV – in English without subtitles.

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Here’s a little recap of the crime. A nurse has disappeared after her shift at a health centre in Pembroke Dock, by the River Cleddau which forms a salt marsh and estuary in this part of West Wales. It looks like DS Rick Sheldon (Harrington) might catch the case, but his boss wants a more experienced detective to help because when Abbi Rayner’s body is discovered the ligature marks on her neck and the heart knot carved in a nearby tree echo two murders that rocked the town 12 years prior. So, DI Ffion Lloyd (Rhys) is drafted in from Cardiff.

Someone is serving time for those murders. So, is this a copycat, or has there been a miscarriage of justice.

And here’s a recap of the romance. Though Sheldon is now happily married, he and Lloyd were once an item. They’ll be working side-by-side, night and day on this case and Lloyd still carries the hurt of their breakup with her. Sheldon’s wife, Helen, feels threatened by DI Lloyd’s return, but is also connected to the case as she was a work colleague of the murdered nurse. Things could get tricky on that front.

For a full recap on The One that Got Away / Cleddau, see our in-depth preview here. For more crime fiction in a Celtic language, try the Scottish Gaelic program An t-Eilean.