~ Spoilers Follow ~
What was it exactly that let me down about this book? Not really the ending because I kept thinking I hope the ending is really good and lifts the story but it didn't. One disappointment was that not a whit was gleaned from the "Alien" signal. A fair amount of the story was spent contemplating the significence and meaning of the signal, then it strangely changed but for no reason that the reader was ever to learn of.
Good riddance to Krug who blasts off into space at the end looking for his aliens leaving the mess he had created on earth. He could so easilly have given the androids what they had wanted and still achieved his goals. He could have even just kept them hanging on indefinintely. Why did he just throw it all away with a mind shunt and expect Thor Watchman to just see the error of his ways and carry on like nothing happened. That just wasn't convincing.
I felt that the whole issue of human attitude towards androids was too superficiallly explored, the philisophical question of what makes us human was just skirted around. "They're just things!" Krug would irrationally exclaim whilst acknowledging that Thor Watchman (an android) was his closest companion, a being he would be happy to mind shunt with. Would he have been happy to shunt with a toaster?
That said, it wasn't terrible, it just could have been handled better.