Keystone - S. C. Garrett

Eight caches down. But the work isn't finished.

Blue Thom and Joaquín push west into California, following whispers of Vel'kari remnants scattered across the territory. The guardians are growing stronger. The Collectors are getting organized. And somewhere in the mountains, a prize waits-the Keystone, an archive containing secrets the Vel'kari left behind.

Blue Thom isn't the only one hunting it.

A ghost moves through the frontier. She reaches cache sites before he arrives and vanishes before he can catch her. She knows the old doors. She reads the old language. And no matter how close Blue Thom gets, she slips away like smoke.

Whatever she's after, Blue Thom can't let her reach it first.

The hunt leads toward a revelation that will reshape everything.

Book Three in the Blue Thom series-a weird western saga of alien legacy, frontier danger, and secrets buried deeper than the earth.