Marcail sees the Half Way Rock as nothing more than a resting place on the Scottish coast until the sounds of the waves, wind and rain one day appear to her as voices, calls for help, final words long lost among the depths.

But why her, why now?

An answer comes only when she finds herself precariously perched on the rock's mirror-image on the other side of the North Sea, the Kjeragbolten, and suddenly the voices make sense.

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Marcail is given mesmerising presence by one of film, tv, radio and theatre's most accomplished performers Sheila Reid, whose range encompasses every kind of character from Benidorm's Madge to Martin Guerre's Celestine, and the exciting and captivating talent of Kiran Sonia Sawar recently seen in Channel 4's series Truelove.

With a stellar supporting cast including French-Tunisian Amina Ben Ismail, fresh from her central role in Netflix's Under a Dark Sun and the Oscar-nominated film Take My Breath, and Polish-Austrian-Canadian Ewa Kasp, well known to European tv audiences through her characters in a number of popular long-running drama series.

Alongside Norway's Aleksander Varadian, Finland's Veera Lummi, Scotland's Cameron Mowat and Austria's Mara Marxt the tale is sensitively and intimately woven by Helen Jessica Liggat.