The official BBC synopsis describes the story as the case of a young, talented ballerina found dead on an ancient stone altar, which unearths another tragedy that affected the community years ago, when three children disappeared into the local woods and only one returned.
The series, which was largely filmed in Belfast and the surrounding areas of Northern Ireland, as well as Dublin, has captured the public's attention for its intricate narrative and complex characters.
The woods where the murders take place were filmed in Tollymore Forest in Northern Ireland, a location that was also used for Game of Thrones and the movie Dracula Untold.