In the quietude of spiritual inquiry, where the veil between worlds thins, George Winslow Plummer offers a lantern for seekers of inner truth. Rooted in the mystical wisdom of the Rosicrucian tradition, A Brief Course in Mediumship does more than guide—it initiates. Plummer’s vision transcends popular notions of psychic phenomena, insisting that true mediumship must be grounded in conscious awareness, moral discipline, and a deep reverence for spiritual law. Through practices like psychometry, clairvoyance, and controlled trance states, the aspirant is not merely learning to receive messages, but to refine the soul as a vessel of higher purpose. Mediumship, in this Rosicrucian frame, becomes not an end, but a sacred means of spiritual evolution—for self and for humanity.