This was my first Attanasio novel, one I discovered by accident, when working at a bookstore 14 years ago. It was Attanasio's second novel, after _Radix_, and clearly not his best work.
The story is about Carl Schirmer, a nerdish accountant transported into a world of floating islands and strange creatures, located in a bubble inside a black hole. A living island with powers over space-time gives Carl a new improved body in return for doing various life-saving tasks. It is in this book that Attanasio introduces the villainous Zotl, perhaps the most evil alien beings in all of SF, and their enemies, the mysterious Rimstalkers. Both species return for a final showdown, in _The Last Legends of Earth_.
_In Other Worlds_ is fast-paced and enjoyable. While not of the same calibre as _Radix_ and _The Last Legends of Earth_, it is far easier to read. Most readers would also find it easier to identify with the hero, and other characters, of this novel than those of _Radix_. However, Attanasio crams too many elements, too many gadgets, into the plot, and that detracts from the main story of Carl, his quest, and his love interest(s).
Though an excellent fantasy writer, and imaginative as hell, Attanasio has trouble with the science in science-fiction. That could explain why he switched to fantasy later on. The science in _In Other Worlds_ is no better than that of Star Trek, sad to say.