Hinterland (2013)

The easiest place to start with Welsh crime drama. Every scene was filmed twice, once in Welsh as Y Gwyll and once in English, with a little subtitled Welsh left in the English cut. Aberystwyth and the Ceredigion hills do a lot of the talking: rain on slate, empty farmhouses, roads that seem to end nowhere. Pick Y Gwyll if you're learning or want the fuller sense of place; pick Hinterland if you want the easier way in. Three series, and the first is the slowest, so give it two episodes before deciding.