If you look on the right side of his website he has a section that explains the reading order. -->
http://www.stevejordanbooks.com/novels.htm
"The First Expedition" is a sequel to "The Onuissance Cells" but the rest are independent. I think it's a great deal myself. I've read the above two books and "As The Mirror Cracks" and enjoyed them very much. Keep up the good writing Steve!