In 1888, Katherine Tingley, a medium and clairvoyant, continues to have a childhood vision of a white city on a sundown sea. While serving the poor at her Do-Good Mission on Manhattan's East Side, she encounters William Q. Judge, a mesmerist and leader of the American Theosophical Society. He recognizes her potential, convinces her to become his student, and guides her on a spiritual path that could make her mystical dream become a reality. After Judge's passing, Katherine assumes leadership of the Society and embarks on a world crusade to spread brotherhood, learn from ancient cultures, and search for a mystical Himalayan Mahatma. In 1900, she moves the Theosophical headquarters to San Diego. Here, she sets out to establish Lomaland - a sacred space of learning, artistry, and divine harmony, built on a barren peninsula yet brimming with hidden potential. As people from around the world converge to share in her vision, they form a community united in purpose to spread enlightenment. However, betrayals, lies, and libels accumulate until a monumental court case ultimately decides her future and the fate of the white city on a sundown sea.