Well, the first series is about a house-hold cat named Rusty. Who leaves his Two-legs to join a Clan of cats who live in a forest and compete with three other clans.
RiverClan- a clan of cats who hunt fish and can swim
WindClan- The clan that lives on the moors and runs faster than most other cats and live mostly off rabbits.
ShadowClan- Mostly made up of evil cats that are hungry for power and territory and have the record for most attacks on other clan territories!
But ThunderClan is loyal and strong, they live in deep undergrowth and hunt squirrels and mice, thrush, birds...
Well, Rusty soon grows up in the clan and even rises to be Leader later on!
The plot is that the Deputy- Redtail is killed and there is a few loose ends and untold details about his death that the kittypet (House-cat) is curious about. He makes tons of friends and soon falls in love, while all at the same time battling with his emotions and peacing together the facts of Redtail's murder. Soon to find that he has to somehow reveal that one of his (supposed 'trusted' clanmates) is the killer and the former kitty-pet is fighting to tell his leader of the bad kitty within the clan that may pose a threat to the entire forest!
But thats only the first series... I fell in love with the books after I read the first series! I now own every book out by the authoress Erin Hunter! She is truly amazing! I'm sure if you picked up the first book somewhere of Warrior's you'd indeed love them too!