I didn't like it AS much as some of the other books from Marshall (loved Spares, Only Forward and One Of Us), but still a darn good read. Really hated to see the protagonist slipping in thoughts of not having another book in him, hope that's not allegorical!. I do have a suggestion; if you're a "happy" person and like to read "happy happy" books, Michael Marshall is probably NOT for you. His characters/story lines are dark, the segues can be hard to keep up with, and you'll probably have to read the book at least twice to pick up on nuances you missed. The Intruders is no different in this regard, but that's why its so much fun to read!  If you like to be mentally twisted up in a book, Marshall's writing will accomodate you. He often comes across as being a great deal more about the sidebars/interactions/thoughts/situations than his actual endings. So, if you are looking for black and white/easy reads, he(and this book) is probably not going to be your cup of tea. This is coming from someone who likes both, so not slamming one genre over another. However, from reading a few of the reviews it seems like it might be good to say this upfront
His characters/story lines are dark, the segues can be hard to keep up with, and you'll probably have to read the book at least twice to pick up on nuances you missed