Via Pantano:

The Fraternity of Myriam (or Miriam) is a sodality that practices a lunar-form of spirituality which includes the formation of a collective chain of initiants to exercise rituals designed to cultivate subtle energies for the purpose of distant healing. The Myriam practiced a sophisticated liturgy of rituals that engaged the use of sigils, ablutions, astrological observations, and fasting. The Lunar-based spirituality was intended to cultivate and exercise a maternal form of love (Myriam, Mary, and Isis are Lunar archetypes) or inner fire for the purpose of purifying and sublimating the four constituent bodies (elements or planes of being) of the Self: Saturnian (physical), Lunar (astral), Mercurial (psyche), Solar (spiritual), and held in balance by Hermes (consciousness).

Se legge Italiano, there are copies of Il Mondo Segreto available from various online bookstores, but I don't believe it has been translated into English.