The story takes places in 17th century, France. Belmondo, a son of a noble father and a deceased witch mother, was born and raised in a cloister's basement. He is the master of an underground prison and has the rights to use any means to bring out confessions from his prisoners, namely by using "torture". With his eye, he is able to see through them... That is, if they do not comply to his questions.
[Note : the name 'Belmondo' is taken from a very famous French actor, Jean-Paul Belmondo]