The Witcher: Sirens of the Deep

Geralt of Rivia, a mutated monster hunter, is hired to investigate a series of attacks in a seaside village and finds himself drawn into a centuries-old conflict between humans and merpeople. He must count on friends — old and new — to solve the mystery before the hostilities between the two kingdoms escalate into an all-out war.

Official website :https://www.netflix.com/title/81484026