The Stoneheart Trilogy, Book Three: Silvertongue (Stoneheart Trilogy, The)

The battle between the statues and the gargoyles in London rages on, and twelve-year-old George Chapman and his friend Edie are caught in the middle. The clock has struck thirteen, and time is frozen. The citys inhabitants have mysteriously disappeared, and snow piles up in the streets. George is now sure that his destiny is linked to the Walkers destruction, but first he must deal with the Dark Knight, a formidable foe who stalks George slowly and deliberately, knowing that things must come to their inevitable end, in what must surely be the decisive and final battle.