I've been desperately searching for a book I loved on every level that I read when I was at school (20 odd years ago).
I've asked the local librarians, Google, you name it I've looked (even thought of calling my old schools to see if they would have my library record).
The few bits of memory I have of this book are that it was set on an Earth where the stars were blocked out by some other interstellar race with a veil or bubble of some kind.
The main character feels that this veil/bubble may have been put in place due to their fear of what the human race was capable of and often makes references to personal nano-tech upgrades and quotes the dollar price. I think it was about a detective or a guy who was trying to look for someone/something and used these devices on a nano scale to find them.