MessoCorps (Call to the Void) by Robert Royal Poff

Master Maloney finds himself freed from an Arizona prison by an enigmatic group of government officials who claim he could be the key to solving a decades old mystery. Traveling miles underground to an off-grid bunker he’s thrust face to face with a being that warps his perception of reality forever. But when he finds out the cryptic secrets the facility harbors he must decide who and what he can trust to regain his freedom.

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