I've never heard of the game SHADOWKEEP, but I found this book in a quarter bin and decided to pick it up. First off, let me say that this book reads like one of those old adventure games: very straightforward and linear. It has no plot twists or complicated character interactions. The characters move from one locale to another without having to make any really difficult decisions. Mr. Foster did an excellent job of taking these two dimensional computer game characters and bringing them to life in a vivid, enjoyable way. Their interactions with each other were amusing at times and almost poignant at others. The storyline was really simple, but thoroughly enjoyable. Good versus evil in a story where failure will result in the end of the world. Nothing deep or intellectual about it; just a romping adventure. A good book for a plane trip in that it doens't really take all that much concentration or thought to enjoy and it was very fast paced.