The New York Times Zofia's last words to her brother were a promise: Abek to Zofia, A to Z. When I find you again, we will fill our alphabet. But the deeper Zofia digs, the more impossible her search seems. How can she find one boy in a sea of the missing? In the rubble of a broken continent, Zofia must delve into a mystery whose answers could break her--or help her rebuild her world.