What a pleasure to encounter a first novel as self-assured and effortlessly told as Ayad Akhtar\u2019s \u201cAmerican Dervish.\u201d Mr. Akhtar, a first-generation Pakistani-American, has written an immensely entertaining coming-of-age story set during the early 1980s among the Pakistanis in the author\u2019s hometown, Milwaukee.