The Doomsday Key: A Sigma Force Novel, Book 6

The bizarre murders thrust Commander Gray Pierce and Sigma Force into a race against time to solve a riddle going back centuries and to a ghastly crime against humanity hidden within a cryptic medieval codex.

Aided by two women from his past, one his ex-lover, the other his new partner, Gray must piece together the horrifying truth. But the revelations come at a high cost, and to save the future, Gray will have to sacrifice one of the women at his side.

That alone might not be enough, as the true path to salvation is revealed in a dark prophecy of doom. The ultimate nightmare is locked within a talisman buried by a dead saint, an ancient artifact known as the Doomsday Key.