My favorite book of 2014. Hiding the rest in case of spoilers, mostly form-related. 
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 Griffin starts with the form of Jean Stein's "Edie: American Girl" and adds photographs of and artwork by the fictional Addison Stone to create a portrait of her life, tragically and somewhat mysteriously ended at the age of 18. Interviews are with Addison's family, friends, exes, teachers, etc., and Griffin keeps each voice distinct and engaging. More impressive are the visuals in the book; though several different artists contributed to Adele's fictional portfolio, there seems to be a clear progression of style in the artwork, and many of the photographs seems so candid and lifelike that I was ready to believe for the early part of the book that Griffin had departed from fiction and that Addison was real. Months after finishing the book, the whole experience is still fresh in my mind; Addison's life is fascinating and Griffin's careful, loving treatment of the many puzzle pieces of the book is masterful. 
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