The third book in "The Passage" trilogy by Justin Cronin is "City of Mirrors." As of September 2015, the publication date for "City of Mirrors" is December 2016.
The three books in "The Passage" trilogy are fictional novels with a supernatural theme that involves a vampiric virus caused by a failed military experiment and a post-apocalyptic America. The trilogy is published by Ballantine Books. The first two books in "The Passage" trilogy are "The Passage: A Novel" and "The Twelve." Book one was published in 2010 and was on the New York Times hardcover fiction bestseller list for eight weeks. Book two was published in 2012.