I just finished this last night, and the ending took my breath away. The story starts very languidly, painting a celestial world of clockwork and the spheres in gorgeously embroidered language. We are introduced to Mercurio, the god of the first planet, and his mysterious visitor, a beautiful young woman with memory gaps who literally falls from the sky. The story draws clear parallels between the characters and their celestial counterparts, the gods and their planets or constellations in a way that keeps you guessing as to the identity of the visitor. Just like Mercurio's own efforts to stage a grand spectacle for Sol, the author sets the stage for a spectacular finale. Her mastery of style really makes that finale sing.
I recommend this for people who like Tanith Lee, epic style, and a writer who plays mischievously with both language and the reader.