In a world where magic intertwines with danger, Geralt of Rivia returns for a new adventure that takes him to the depths of the ocean. After receiving a mysterious message in a bottle, the famous monster hunter embarks on a journey to the remote shores of Skellige, where legends of mermaids and sea creatures awaken ancient fears. Upon arrival, he discovers that an ancient pact between humans and mermaids has been broken, triggering a wave of attacks on the coastal villages.
As Geralt tries to unravel the complex relationship between the inhabitants of Skellige and their dangerous neighbors, he comes face to face with an exiled mermaid, who reveals to him that a powerful relic, capable of controlling the sea, has fallen into the wrong hands. With the help of his eternal friend Yennefer and the enigmatic bard Jaskier, Geralt delves into a world of betrayals and unexpected alliances.
The challenges increase when an old enemy resurfaces, seeking revenge and affecting not only Geralt but the balance of the entire continent. In his struggle to restore peace, the three friends must confront their own demons and question what is truly worth protecting. Amidst monsters, magic, and a stunning landscape, this new installment of the saga reminds us that, in the depths, secrets can be darker than they seem.