After stumbling a bit in volumes 2 and 3, No Man's Land gets back on track with volume 4. The big draw here is Bane, who has been sent to Gotham by a mysterious backer for purposes unknown.
And really, that turns out to be the weakest part of the volume. The opening chapter with Bane's return is just horribly written, with Batman and Bane talking way too much. The other parts, where Bane mows a path through downtown Gotham, isn't that interesting to read and only builds up to a small plot point.
However, the other chapters in the book completely make up for that let-down. Devin Grayson returns to pen two amazing stories, one involving Leslie Tompkins and the MASH sector, and the other featuring Clark Kent visitng NML. Dale Eaglesham also returns as artist, and draws a great Billy Pettit who is looking more crazed than ever. The Two-Face/Montoya/Gordon story also comes to head, as Two-Face puts Gordon on trial for war crimes. It's one of the best arcs of No Man's Land, and bring this subplot full circle. After that, Gordon and Batman finally have their long-awaited chat. Then it's simply a matter or repositioning everyone for the final volume, and finding out who the mysterious outside interest is.
If I have one complaint, it's that DC didn't bother to include the Nightwing arc of NML in these volumes. In volume 3, he was assigned to retake Blackgate Prison. Here he's already done it. I've heard Nightwing's adventure in Blackgate was pretty good, and it's unfortunate it didn't make the cut.
If you've read the other 3 volumes, continue reading. Volume 4 does a great job of continuing this major Batman crossover arc.