The finale. Cut down to half their original number, the surviving guests are in danger of losing their minds. With the likelihood of survival rapidly diminishing, they must turn to one another for comfort and protection, but trust is in short supply.
The guests on Soldier Island are dying, one by one, according to the rules of the nursery rhyme "Ten Little Soldier Boys." As they make plans to combat the killer, the body count continues to rise—and dreadful secrets are brought into the light.
In the premiere, 10 strangers are drawn away from their normal lives to an isolated rock off the Devon coast. As the mismatched group wait for the arrival of the hosts, the weather sours and they find themselves cut off from civilization with a murderer in their midst.