I think this is a great start to the second series of Warrior Cats! It follows Brambleclaw, a minor character of the 1st series, who receives a prophecy to journey to the sea and save his cat clan! Accompanied with his annoying "friend", adventurous sister, an ignorant apprentice and two other feline friends, he sets off on the adventure of a life time! There are many Warrior Cats books, including novellas. I would recommend this book to all cat and action lovers. My only warnings would be that it can be quite sad or have some yucky descriptions and death in it.
Although I strongly think you should like what you like, Nikki can be quite rude at times. There are also mentions of her watching inappropriate things on TV. These books are good as light-hearted reads, but I read them in Year 4 and now I see some things I think parents should check.