This is the fifth book in the ACRO series. This series just keeps getting beter and better. I was advised that this one ended with a cliff hanger. I'm really glad I knew that in advance and waited until only a couple of weeks until number six comes out to read it. I cannot wait until then! I love the way each book follows up on the realtionships formed in the previous books. The threads of Annika and Creed and Dev and his lover (don't want to spoil it with the lover's name if you haven't read the previous books!) continues throughout this book as well. I highly recommend this book and the entire series. They really should be read in order and don't start one until you have the next one on hand because you may just want to keep reading about these riveeting characters.