My Enemy's Enemy — Glynn Stewart

The demon Ekhmez ripped out the heart of America's supernatural defenders and strengthened their foes. The agencies of the Omicron branch of the US government face a newly expanded threat with their resources stretched to the breaking point.

To hold the line, newly promoted Commander David White of ONSET is sent to forge an alliance with the Elfin Conclave, a supernatural organization with its own history, grudges and politics.

When violence wracks the Conclave and guts the allies they sought, David White must hunt the Elfin's foes across the Pacific northwest, taking any help that comes his way--because when the world is on fire, can you turn away your enemy's enemy?