Attempting to summarize this book would cause an instant mental breakdown, so I won't. Instead, here's a list of elements that are part of the story:

• A mega-blackhole or something like that which defies natural laws called the Kefahuchi Tract.
• AIs
• Physics and quantum computers
• A serial killer
• Aliens
• Genetic engineering
• A circus

That's just a partial list, and it's worth noting that Harrison's take on many of those elements is very, very weird, so the AIs are not at all like what one expects of AIs, and aren't even called AIs.

Overall, I liked the book but it I think it's a bit miserly with plot development. Basically, the book seems to be a series of disconnected chapters alternating between three different characters, with only the smallest hint of connecting tissue. Finally at the end it all comes together (more or less), but I think the novel would be better if there were a few more hints earlier on in order to tantalize the reader. As it is, you pretty much have to keep going on faith. Fortunately, the book is short enough (just under 300 pages) that this does not become tedious.

On the plus side, the writing is quite original, reminding me perhaps of Rudy Rucker just ever so slightly. It'd definitely worth reading if you want to try something different and interesting, but you'll have to be patient.