Cats of the Clans

In the introductory chapter, "Three Lost Travelers", the kits Mosskit, Adderkit and Blossomkit have somehow walked from StarClan to Rock's home under the earth. Rock tells the three that they did not live long enough to learn about their Clanmates. He says he will answer their questions "about the cats you left behind." Rock describes himself as "the keeper of the world beneath the one your former Clanmates walk."
The remainder of the book consists of Rock's stories about each Clan, and various cats (or a group of cats) within the Clan. Rock describes major events in the cat's life, and often comments on why the cat is special or acted as he/she did. There are also stories about a few cats from the Tribe of Rushing Water, SkyClan, and BloodClan in addition to some loners and kittypets.
Although Rock, as the narrator, claims neutrality, the book does not treat each Clan equally, devoting more space to ThunderClan cats and being highly critical of one of the other Clans. This is to be expected since readers get to know more of the ThunderClan cats from series than those from the other Clans.
[edit]Outside Clans
For the groups that cannot be classified as Clans (SkyClan not included), there is little more than a fact file featuring Clan character, habitat, their version of leader and deputy, and notable history, as well as a short story about it. There is also a quick guide to all of the loners, rogues, and kittypets featured in the Warriors series.
[edit]The land
This group of sections features a quick guide to both the habitats (forest and lake) of the Warrior cats, as well as Fourtrees, Highstones, the Moonpool, the Island, sun-drown-place, and a story of how the Moonstone was discovered.
[edit]Ceremonies
This section features what happens in the ceremony to initiate a new cat of a certain position, using a specific cat as an example, including how they felt about becoming that position. It also features all of Firestar's nine lives and a guide to all of the medicine cat herbs.
[edit]Mythology
In this section, we learn that the Warriors have a small mythology featuring three Clans with wild cats: LionClan, TigerClan, and LeopardClan (actually cheetahs). There is the story of how LeopardClan won the river, how the snakes of Sunningrocks came to the forest, and how TigerClan got their stripes.
[edit]General guides
There are general guides as well, such as a guide to the prophecies in the Warriors series and other, non-prey animals that inhabit their homes.