The series was co-produced by S4C, Channel 4, and the producers Duchess Street Productions and Triongl in association with APC Studios.
[1] The show is based in Carmarthenshire, Wales where two of the leading actors, Alexandra Roach and Iwan Rheon are from.
Significant parts of the series were also filmed in the Tywi Valley, in the towns of Llandovery, Llangadog, Llandeilo and Carmarthen.
It follows a young journalist, Cat Donato who is played by Alexandra Roach, whose best friend Ela Roberts went missing 18 years ago.
A quiet gardener named Joe Pritchard played by Iwan Rheon, is arrested following a confession but he cannot explain what happened to the body.