Since there's a new DC Comics animated film about the "Rise of the Supermen" you may be interested in a young-adult novelization of the story (that's a good, quick read of 190 pages). It's called Superman: : Doomsday and Beyond, by Louise Simonson. (Bantam, 1993).- It's a story about 4 characters who appeared and resemble in some way, and claim to be Superman after he temporarily died in a 1993 story line. I have the whole story in comic book form that covered 1 plus years of comics, but this provided a good, short, summarized version of that long story (the comic books in trade paperback are about 3 inches thick).
Louise Simonson has always been a great comic book writer, and she did a fantastic job on this novelization. As a bonus for comics readers, there are a couple of illustrations by famous comics artists Dan Jurgens and Jose Luis Garcia-Lopez.
Well-worth the read! (if you can get an old copy... I think it's out of print).