The Backlash Mission by Timothy Zahn (Blackcollar 2)

In this book the Blackcollars try to find Backlash, the drug used to create blackcollars, on Earth. There is an old Military base near Denver that might hold the recipe. But Denver isn’t like the rest of Earth. Here the crime bosses of old rule, and they hire renegade blackcollars to do their dirty work.

The Fever is gone and i like this book, it might not be great litterature, but its catching.