Schroeder's ambitious sequel to 2006's Sun of Suns further explores Virga, the vast enclosed realm containing a miniature cosmos of floating worlds, wheellike townships and intriguing mysteries about the construct's origins and creators. Heated and lit by numerous artificial suns, the individual populations have evolved on divergent paths. When the delightfully amoral Venera Fanning finds herself on Spyre, an ancient and decaying cylindrical world...