Dresden Files: Boston
Yup, there is a dragon sleeping underneath the city. Where do you think all that steam from those manhole covers comes from? The dragon is there due to some ancient bindings and rituals and as long as the dragon sleeps, everything is all right.
The Big Dig unearthed a portion of the dragon, which killed some people a while ago and lately there have been some minor earthquakes. The USGS says it’s just some minor plate shifting but some suspect that the dragon is waking up. If that happens it will be San Francisco 1906 all over again.
There was a plot by Mercyanara involving the Dragon. From what I can piece together she was trying to put the dragon to sleep, which, I am told, would have been bad.