From the back cover:
Though the Great Houses and their vassals play the eternal Game of Thrones, there are some who do not. The men of the Night's Watch guard the immense and icy Wall, built in the ancient days of Westeros to hold back the terrible things of the Long Night. Once a mighty cohort of brave knights and lords who gave up everything to protect the Seven Kingdoms from the predators of the Far North, the Night's Watch is now a rag-tag band of thieves, murderers, and those who ran afoul of the political machinations of their enemies. When the wildlings stir on the other side of the Wall, and the cold winds rise once more, will they be enough to save Westeros? Night's Watch gives you everything you need to add this once noble order to your A Song of Ice and Fire Roleplaying chronicle. It includes rules for playing men of the Night's Watch and wildlings alike, as well as new information about the mysterious Others. Pray, men of the green lands, for Winter is Coming!