Midnighters #3

The third and final book in New York Times bestselling author Scott Westerfeld's Midnighters series.
The five teenage Midnighters of Bixby, Oklahoma, thought they understood the secret midnight hour--until one morning when time freezes in the middle of the day.
As they scramble for answers, the Midnighters discover that the walls between the secret hour and real time are crumbling. Soon the dark creatures will break through to feed at last . . . unless the Midnighters can find a way to stop them.
Blue Noon is the third and final book in the Midnighters trilogy, from the New York Times bestselling author of the Uglies series.