Book 1

Invasion

by Cody Martin, Steve Libbey, Dennis Lee, and Mercedes Lackey

Published 27 January 2012

The world had become used to the metahumans - people sometimes perfectly ordinary, but sometimes quite extraordinary in appearance - who mostly worked with their  governments as high-powered peace officers, fighting crime, and sometime


Book 3

It's go time once again for the meta-heroes including fire-bender John Murdock, hacker-witch Vikki Nagy, healer Belladona Blue, super-quick Mercurye - and most of all for their ghostly ally, Seraphym, the spirit of the world Verdegris.


Book 4

Collision

by Mercedes Lackey and Veronica Giguere

Published 18 October 2015
Destroying the Thulian North American Headquarters has not made life easier
for ECHO, or the world. The Thulians continue their attacks, first in
unpredictable incursions, then with another all-out assault on ECHO,
orchestrated against ECHO headquarters across the world.


Book 5

Avalanche

by Mercedes Lackey, Veronica Giguere, and Dennis Lee

Published 3 January 2017
Ultima Thule has been destroyed—but somehow the Thulians mounted an even bigger force to destroy Metis.  The Metisians that escaped the carnage and destruction of their secret city now must somehow find somewhere safe to go—without getting snapped up by v

Echo One

by Mercedes Lackey, Cody Martin, and Dennis K Lee

Published 27 April 2020