Jack Staples and the City of Shadows

Jack Staples and the City of Shadows, Book 2 by Mark Batterson & Joel Clark and published by David C Cook.

Jack and Alexia find themselves even deeper in the battle between the Author and Accuser. Though beginning to discover what it means to be the chosen ones, they each face a harrowing test. For Jack it is a question of trust, and for Alexia, a question of loyalty. But when Alexia is captured and with Jack seeking the Forbidden Garden, the prophecy that they will both destroy and save the world seems far from coming true.