In a small town on the Celtic coast, an ancient legend haunts the lives of the inhabitants. Young men are disappearing at sea. Some see it as the work of the devil, others blame a sea creature from the ancient world. All the clues seem to lead back to the city of Ys. Léon and his friends decide to investigate, even if it means descending to the depths of the abyss.

• Bethan Siân
• Talwyn Baudu
• Azenor Kallag
• Elfed Wyn Jones
• Nely Van Seventer
• Beca Tredomen
• James T. Owen
• Simon Lovatt