The Welsh TV crime drama Hidden/Craith (2018-2022), one of many TV crime dramas set and produced in Wales to have come out in recent years, scrutinises socially constructed notions of femininity. It does so in a way that both appeals to a broad audience, ensuring its marketability across national borders, as well as by exploringculturally specific concerns of how Welsh notions of femininity are entangled with narratives of nation. This chapter examines the representation of constructs of Welsh femininity in the first season of Hidden/Craith on the level of characterisation, production, and reception and contextualises it within dominant narratives of nation and the current political representation of Wales as well as the phenomenon of transnational TV crime dramas. The cultural trope the series is engaging with most clearly is that of the ‘Welsh Mam’, showcasing both its enduring legacy in defining ‘acceptable femininity’ as well as subverting it in the portrayal of one of the central transgressors by means of grotesque exaggeration. The exaggeration of the trope in the ‘monstrous Mam’ of the series draws attention to its own artifice as well as questions its place in contemporary Wales.