The book ""Letters of Arthur W. Machen: With Biographical Sketch (1917)"" is a collection of personal letters written by Arthur W. Machen, a Welsh author and mystic, to various individuals during his lifetime. The letters provide insight into Machen's thoughts on literature, spirituality, and the occult, as well as his personal relationships and experiences. The book also includes a biographical sketch of Machen written by his son, Arthur W. Machen...