On the eve of a global pandemic, Kathleen Gough, a theatre professor, becomes immersed in the lives of five artist-mystics, each of whom is a pioneer in her field: Hildegard of Bingen (1098-1179), the first known musical composer; Eleanora Duse (1858-1924), the first modern actor in the Western world; Simone Weil (1909-1943), philosopher, activist, and mystic, whom Albert Camus called "the only great spirit of our time"; Marina Abramovic (b. 1946), "the grandmother of performance art"; and Hilma af Klint (1862-1944), the first known (and belatedly acknowledged) abstract painter. Each time Gough crosses a threshold into their world, she is compelled to attend courses, seminars and workshops that are simultaneously about dying and healing. Curious to learn more about the relationships between art practice, dying, and healing, Gough imagines the five artists as wisdom teachers in a mystery school. In a series of eight lectures, she turns to performance theory to provide a framework for engaging with the unknown world. In Theatre and the Threshold of Death, Gough makes a persuasive argument for the world-making power of relational thinking in our increasingly polarized age.