Fire and Ice is a children's fantasy novel, the second book in the Warriors series, written by Kate Cary under the pen name of Erin Hunter. The plot centers around Fireheart and Graystripe, newly promoted warriors of ThunderClan, which is one of the four groups of feral cats living in the wilderness. Fireheart learns that his best friend Graystripe has fallen in love with Silverstream, a warrior from RiverClan, even though it is against the cats' "warrior code". The book was first published on 1 June 2003 in the US as a hardcover. Since then, Fire and Ice has been released in paperback and e-book format in other languages. The main theme of the book is that the type of person one is inside is more important than the way one seems from the outside. The book received mixed reviews: the negative reviews criticized the flat characters, and how troublesome it was to flip back to the characters list due to the large number of cats; positive reviews praised the suspense and rising tensions in the book. Source: Wikipedia (en)