Fires of Winterfell: the Void (Vol. 141)

Summary

In a decaying cathedral on the edge of the world, a street-smart thief searching for a legendary key discovers a mysterious letter delivered by a bird made of pure mist that could shatter the fragile peace treaty between warring kingdoms. Pursued by a ruthless mercenary leader heading the vanguard of war, they must race against time before the iron gates of the underworld swing open.