According to legend, Monte Verita was the site of an
impossible disappearance from a grotto. But that happened so long ago—surely
the tale must have been embellished. After all, nothing like that could
possibly happen in real life, right? Besides, it is 1938 and we’re attending a
worldwide mystery convention—if something were
to happen, there are many amateur sleuths on hand to solve the case!
One of these mystery addicts is Pierre Garnier, newly wed to
his wife Solange. Pierre is something of an expert in the mystery genre and he
is delighted at the opportunity to meet so many enthusiasts. But as fun as it
is to participate, some of the members get involved in quarrels with each
other. Finally, one member accepts a challenge to duplicate the feat of the
impossible grotto disappearance… but before he can pull this feat off, he
himself is murdered in a locked room!
It’s a good thing the police saw the guilty party at work: a
woman was seen stabbing the victim and then closing the blinds… but the
description of this woman oddly resembles Pierre’s new wife Solange, who has
never really told her husband anything about her past… and just before his
death, the victim confided in Pierre that his wife was a multiple murderess…




