This is merely a re-hash of Hofstadter's justly famous Godel, Escher, Bach: An Eternal Golden Braid, with some ideas from Le Ton Beau de Marot thrown in but most of the fun stuff taken out; if you've read those, you don't need to read this. If you've only read GEB, then read this instead of Le Ton Beau de Marot unless you have a particular interest in the art/skill of translation.
This isn't a bad book, apart from the constant use of reference to the "dear reader", it's just redundant because of the above and not nearly as much fun as GEB.
Here's what it's about: minds - specifically what they are/where they come from. Hofstadter's thesis is very plausible to me, despite my disagreeing with some specific things he says. It seems like it might be scientifically testable, too. My beef with Hofstadter is that his research does not seem focused on testing what seems to be the crux axiom of his theory. I'm not sure off the top of my head how to do it but Hofstadter has had since some time in the 1970s to think of a way...maybe it isn't testable after all, but if it isn't then it's just a waste of time and money.
Also Hofstadter HATES mosquitos because they bite him and I think that he subconsciously believes they have no minds simply because of this!