10 Horror Movie Secrets They'll Never Tell You

Unforgettable French horror film Martyrs concludes with protagonist Anna (Morjana Alaoui) being flayed alive by a secret society of individuals who believe that torturing young women will make them enter a euphoric state and see a window into the afterlife.

After Anna apparently enters such a state, the leader of the group, known only as Mademoiselle (Catherine Bégin), arrives and Anna whispers something in her ear, presumed to be an account of what she saw when she became a "martyr."

In the next scene, however, Mademoiselle asks her assistant if he can imagine what comes after death, and when he says no, Mademoiselle tells him, "Keep doubting," before shooting herself in the face.

The mystery of what Anna said to Mademoiselle has agonised fans of the film for the last 15 years.

There are two obvious possibilities - death leads to nothing and the secret society's experiments have basically been a waste of time, or there's something so amazing waiting beyond that Mademoiselle couldn't wait any longer to go there and swiftly took her own life.

But filmmaker Pascal Laugier has kept his lips sealed ever since Martyrs' release, and it's a smart move, ensuring the film has remained a consistent talking point in the horror fandom ever since.