London, late 19th century: Only every 13 years does a secret lodge meet to finally provide irrefutable proof of vampires, demons or other monstrosities – and to award a prize of 1,000,000 pounds.

Five eccentric contenders present their sensational discoveries: an ambitious vampire hunter, a self-proclaimed monster slayer, a daring scientist, a spiritualist medium, and a fanatical inquisitor with a legendary book.

But the evening takes an unexpected turn – and suddenly the focus is no longer only on supernatural creatures, but on very human depths.

The guests themselves take on the role of investigators, examining evidence, scrutinizing alibis, and uncovering false leads. Who is lying? Who is merely playing a part? And who really got their hands on the "forbidden book"?

An atmospheric murder mystery dinner full of dark humor, Victorian horror and sharp-tongued verbal sparring – where in the end not only is a murderer unmasked, but also a vote is taken on the best “proof” of the supernatural