Long and drawn out. The weakest book in the series so far. There were quite a few good moments, and the story was moved forward a bit but there was a real lack of impetus. After the digression into back-story of the previous volume, I had hoped Wolves of the Calla might provide more progress toward the tower. Instead, we have a very long setup to the final confrontation with the wolves. Along the way, Roland's ka-tet undergoes some changes.