Only Superhuman, by Christopher Bennett, is a hard scifi superhero novel. Set in the future, genetically-enhanced humans have moved apart from the normals and gone to live in colonies on the astroid belt. Some of these humans have powers that are decidedly beyond those of the average man, and to help preserve law and order, a group of such humans have banded together to fight crime. The group that they have formed is called, "The Troubleshooters".
The Troubleshooters have their work cut out for them, from fighting terrorist groups to investigating shady superhuman collations, to evaluating partnerships with other groups. Bennett's story follows the adventures of a Troubleshooter named Emerald Blair, a.k.a. the Green Blaze, as she is drawn into a web of intrigue. After all, in order to stop evil, you first have to recognize it as such.
The story's strengths are those traditionally associated with a comic book. There are excellent fight scenes and an action-packed story keep the reader engaged. Also, now we get to hear more of a superhero's inner monologue. I found this to be somewhat entertaining at times, particularly the sections of the book that involve Blaze's concerns about making an entrance and tossing off one-liners. Lastly, I respect Bennett for writing a plausible, hard-scifi superhero story. "Hard Science Fiction" is a term usually reserved for stories with scientific advances which, given the state of science at the time of the books publication, seem both futeristic and reasonably plausible. (The opposite would be "soft" scifi, where the science works in a manner functionally indistinguishable from magic. Think of Superman's "I'm an alien with a human body type and I can fly!")
However, the story is not without weaknesses. There were quite a few romantic endeavours chronicled in the story. I don't mind romance in the books that I read, but I do mind frequent scenes with gratuitous details. However, that is the only quibble that I have with the book. Should one enjoy an action-packed superhero story and find such detriments as I have mentioned tolerable, then I would certainly recommend this book.