The Citadel, an ancient fortress-turned-monastery in Ruin, Turkey, is itself in ruins following an explosion and a mysterious plague. Reporter Liv Adamsen barely survived the cataclysms that killed all but one of the Sancti, including her father and brother. Now back in the U.S., she has lost all memory of the Citadel, but a voice in her head repeatedly utters one word: “Key.” Meanwhile, her lover, the freedom fighter Gabriel, languishes in prison as his mother, Kathryn, desperately searches for the thread that connects the Church to the destruction of the Citadel.
As a long-forgotten prophecy of doom draws ever nearer to fruition, assassins bear down on Liv, Gabriel and Kathryn—and mankind’s destiny may depend on their survival.
Hardcover Book : 400 pages
Publisher: Morrow ( June 19, 2012 )
Item #: 13-598919
ISBN: 9780062038333
Product Dimensions: 5.5 x 8.25 x 1.125inches
Product Weight: 17.0 ounces (View shipping rates and policies)

This trio of books is one of the best series of books I've read. Can't wait for the third book. Can't say too much how good this author is. Perfect summer read.
Reviewer: Wayne F