Such is the far-reaching influence of the modern mystic Evelyn Underhill that she is commemorated liturgically by the Church of England on June 15. Her best-known book, Mysticism, was widely read in the first half of the twentieth century and her work continues to have great impact on the theology of contemporary spiritual writers, such as Richard Rohr. Between 1924 and 1938, Evelyn Underhill compiled two personal prayer books for use when conducting spiritual retreats at Pleshey (the retreat house for the diocese of Chelmsford). The prayers were carefully selected and include quotes from a variety of theologians and writers in Christian spirituality, as well as her own very rich, metaphorical, and theologically deep prayers. This volume makes these collections available for the first time.