Blood Infernal (Order of the Sanguines Series #3)

As an escalating scourge of grisly murders sweeps the globe, archaeologist Erin Granger must decipher the truth behind an immortal prophecy, one found in the Blood Gospel, a tome written by Christ and lost for centuries. With the Apocalypse looming, Erin must again join forces with Army Sergeant Jordan Stone and Father Rhun Korza to search for a treasure lost for millennia, a prize that already has fallen into the hands of their enemy.

The search will take Erin and the others across centuries and around the world, from the dusty shelves of the Vatican's secret archives to lost medieval laboratories, where ancient alchemies were employed to horrific ends. Erin will discover that the only hope for victory lies in an impossible act, one that will not only destroy her, but all she loves. To protect the world, Erin must walk through the very gates of Hell and confront Lucifer himself.