From the back of the book:
Catch a Thief
There are deep secrets in the Sixth World, and there are people who will do anything to uncover them. Some secrets reach into the ancient past, but they still have the power to shake the world. What they will do depends on whose hands they fall into …
Dusk was only the beginning. Jane “Frosty” Foster is back and ready to continue her artifact hunt. If they’re game, runners will join her in a chase across North America, from the frozen, bug-filled wastes of Chicago to the political hotbed of Denver to the Deep Lacuna lurking under Los Angeles.
Midnight is the second adventure in the Dawn of the Artifacts series, giving skilled runners the chance to find a second powerful artifact—and perhaps uncover clues about what makes these treasures so valuable.