Elfhome novels

Inventor, girl genius Tinker lives in a near-future Pittsburgh which now exists mostly in the land of the elves. She runs her salvage business, pays her taxes, and tries to keep the local ambient level of magic down with gadgets of her own design. When a pack of wargs chase an Elven noble into her scrap yard, life as she knows it takes a serious detour. Tinker finds herself taking on the Elven court, the NSA, the Elven Interdimensional Agency, technology...

Elfhome. A world of powerful magic, beautiful elves, man-eating trees, frost-breathing wargs, and god-like dragons. Pittsburgh. A city stranded deep in virgin elfin forest. Its population of sixty thousand humans and a handful of elves are pitted in war that will only end in genocide. Winter is coming. Supplies are running low. And hidden vanguard of oni are attacking from the shadows. And children are disappearing.