L'intersigne bookshop was created in 1985 by Alain Marchiset who already had a solid professionnal experience and who became in 1992 a member of the Compagnie Nationale des Experts. L'intersigne bookshop is now recognised as a worldwide reference in its fields of specialisation.

L'Intersigne Bookshop specialises in rare and curious books on ancient and human sciences, occult, and more particularly alchemy, astrology, freemasonry, philosophy, and also psychiatry, medicine, criminology, utopia, conjuring, games and oddities.