Just released is the fictional book "Almost Graceland" from Steve Carlson. According to the author it is a "It's a fun 'what if?' look into one of the most interesting lives ever".
Synopsis:
When I first heard that Elvis was born a twin but that poor Jesse Garon was still born, I couldn't help but wonder. what if he'd lived? How would Elvis' life have been different? Would we have had the Presley Brothers like the Everly Brothers? Or, what if they didn't know about each other? What if they found out in the later part of Elvis' life? How would Elvis feel about that? What would he think? What would the press think. the fans?