And on that note… what happened to Peter and Jamie?

The show’s ending heavily implies that this isn’t just a detective drama, but a gothic Irish fairy-tale. Go figure.

Mr Devlin, in a clandestine confession, admitted that he and his friends had run down Adam/Rob, Jamie and Peter in order to give them “a kicking” after learning that they had witnessed the rape of Sandra.

“You were there, all three of you,” he says, voice shaking on the memory. “And then you weren’t. And then we saw one of you by the tree with your shoes full of blood and your shirt fiull of holes.”

It was at this point, Mr Devlin said, that an inhuman voice began to laugh and echo all around the forest, prompting him and his friend to “shit ourselves”.

“I swear to you, I swear, we never touched a hair on your head, nor your friends’. They were just gone.”

Mr Devlin then adds that he and his friends - wife Margaret included - raised a darkness that day. Some foul spirit, which he believes took on the form of his murderous daughter, Rosalind.

It fits with what fans of the books have suggested previously. “The old gods have a portal between their world and this within the woods,” said one, in a comment on GoodReads. “Woods are actually a place where an alternate universe does exist, in the form of the lives the animals lead, which we humans rarely see. The hint would then be that Peter and Jamie were sacrificed on the stone. So that Adam could live?”

Another agreed, adding their own theory around which of the old gods this could be.

“Cernnunos, as The Horned God, Lord of the Animals is portrayed as human or half human with an antler crown,” they said. “While He is recognised most often through his connection to animals and our own deeply buried, dimly recalled, instinctual animal natures, Cernnunos is also a tree, forest, and vegetation god in his foliate aspect of The Green Man, Guardian of the Green World. His branching antlers symbolise the spreading treetops of the forest as well as his animal nature. As Master of the Sacrificial Hunt, His is the life that is given in service of new life. His wisdom is that the old must pass away to make way for the new.”

We originally classed this as a bonkers theory, but… well, based on that small icon which Frank unearths at the archaeological dig (it looks an awful lot like a carving of a horned figure) we’re on board.

But seriously, what happened?

We have no idea, to be honest, and we sort of expected that might be the case. After all, fans of the books had previously criticised author Tana French for leaving things so ambiguous. The author, though, isn’t all that bothered about the complaints.

“Some people hate [the book’s ending] and I don’t blame them for being annoyed with it, but I think it lies in how the book was positioned,” she said. “It was positioned as a murder mystery, which was a good call… But that means that people are expecting it to fit in with the genre conventions, which do include, if you set up a big mystery, you’re going to give us the answer. And people feel cheated if you don’t.”

Well, quite.

Dublin Murders episode 8 recap: All the questions we still need answers to