This set contains episodes thirteen through sixteen of the first series/season from Ghost in the Shell: Stand Alone Complex. The fourth volume sets aside the Laughing Man plot for now and instead shifts to the Tachikomas. It's a nice variety of episodes and those wanting action, following a more talkative third volume should be mostly satisfied.
Here is an episode summary (in order, with some spoilers if you hadn't seen the previous episode):
NOT EQUAL: A teenage girl, one of the first to have a cyberbrain and kidnapped some twenty years before by the Human Liberation Front, suddenly reappears in the sights of Section 9 - who looks exactly the same as before. Even worse, she's apparently the new focal leader of the HLF. Section 9 is detailed to "rescue" her using any means necessary. All of Section 9 and the Tachikomas get involved, and they get embroiled in a huge firefight. There's probably more action in this episode then the first twelve episodes altogether, which is not necessarily a bad thing.
YES: A reclusive wealthy magnate becomes the target of an assassination plot by a foreign agent. This episode doesn't really expound on the evils of stock and money market manipulation, and really just shows that the Tachikomas are becoming more unstable - at least in the eyes of the Major. The way the episode resolves is disappointing as well.
MACHINES DESIRANTES: The Tachikomas engage in various philosophical debates about robots, appearances, children, and mostly, death. One Tachikoma, who appears to collect books, uses Flowers for Algernon (yet another literary reference) as a reference point. If you don't like how the Tachikomas sound you'll probably get really annoyed by this episode. After the Tachikomas openly lie to the Major (though not with malice) and even begin spying on the Major and Batou (which they notice). Their conclusion is saddening, while simultaneously the Tachikomas are cheering the idea that they were saving themselves. The very last scene is very telling and multi-layered, and one of the reasons why I really like this episode.
AG2O: Batou is saddened as the Tachikomas are led to the labs where each assumingly will experience death, though they seem pretty happy about it the whole thing. Meanwhile he gets assigned an undercover job at the Navy yard involving an an ex-Olympic boxer who is apparently selling secure information. Batou immediately feels a connection as he gets close to the boxer and his wife (the boxer was an idol of sorts), but of course in the end he does his duty, and like the Tachikomas seemingly loses more friends.
While ultimately this set of individual episodes doesn't seem to further any overall plot, the complexity of the Tachikomas and how they work is actually pretty interesting. They play a very important role in the series so don't put aside their episodes so quickly. Overall a fairly decent volume.
The deluxe version comes with the original release, a second DVD with a DTS 5.1 sound version of the show, and a rather cheesey "collectible ID card" with the volume art on it.