“The Narrow Door: A Memoir of Friendship” is a narrative of comradeship and grief, of love and woe. Paul Lisicky offers an honest and sometimes raw account of his relationships with two major players in his life, and outlines the intersection of loss that marked his experience. The work takes up Mr. Lisicky’s friendship with the writer Denise Gess — a long and intimate friendship of 30 years. He describes her vitality, her magnetic quality, her passion for writing and talking about writing.