In Lost in a Sea of Letters, Cyril Uy explores the life and work of Sa?d al-Din Hamuya (d. 1252), a Mongol-era Sufi whose arcane treatises inspired generations of mystics and messiahs. Reading Hamuya in dialogue with contemporaries across Central Asia, Iran, and the Eastern Mediterranean, Uy excavates a world in which knowledge was an embodied sensibility: a way of being that could improvise across all dimensions of human experience. Hamuya's performative writing reworked the foundations of this knowledge, provoking readers to live reality through the cacophony of his Sufi free jazz. Foregrounding Hamuya's deconstructive ethos and radical openness to interpretation, Uy reveals how embracing plurality could thrive as a mode of social, intellectual, and spiritual competition.