Written by Algernon Blackwood, this epistolary narrative explores the relationship between twin brothers, focusing on one man's failed marriage to Marion—a woman whose mysterious power over him masked a deeper spiritual mission. After Marion's death, the narrator discovers he is not alone; an inexplicable force guides his life toward success, operating with uncanny precision. As he struggles to understand this presence, questions emerge about identity, duty, and whether Marion's final words—'I shall try again'—hint at something beyond death itself.