The first sourcebook to take an in-depth look at the clans, this was another one that I never got around to reading back when I was first into this game, largely because I never really liked the clans. The first third of the book presents a reasonably complete history of the clans, covering all the major events from the Exodus of Kerensky to the beginning of the Clan Invasion of the Inner Sphere. It then narrows its focus down to just Clan Wolf for the events of the Invasion from the initial planning through Tukayyid. The middle third breaks down the invasion into more detail, describing each planet taken by Clan Wolf with a brief synopsis of how they did it. The final third describes the military organization of Clan Wolf on the eve of Tukayyid.

I'm still not a big fan of the Clans, but my dislike of them has lessened over the years, and the information in this book does better explain some of the history that led to their return to the Inner Sphere when compared to the information available from the novels. The latter was more of a "we need to destroy you to save you" type of thing, where the version in the sourcebook is more of a "we can't let you save yourselves because we have to be the ones to save you." Both are incredibly arrogant points of view, but the latter is slightly less stupid, as it at least acknowledges that the Inner Sphere was on the verge of recovery when the Clans arrived to "save" it.