Wow. What a ride. (Note: This review is based on the audiobook.) 
 Waking Gods picks up the story ten years after the ending of Sleeping Giants. Over the course of the intervening decade, the ragtag team of scientists and robot-wranglers has evolved into an organized global force called the EDC (Earth Defense Corps). Dr. Rose Franklin heads up the efforts, under the ever-present guidance of the unnamed man who pulls the strings. Meanwhile, robot pilots Kara and Vincent enjoy their life on the road with Themis, taking the giant robot on a worldwide goodwill tour to promote international cooperation and harmony. 
 Until... more robots arrive. Now Earth and all its people are threatened by an alien force that they have no hope of overpowering. If Rose and her team can't come up with solutions, there may be nothing left. 
 Okay, wow again. Waking Gods is an absolutely stunning and addictive sequel that kept my attention from the very first moment all the way through to the end. As with Sleeping Giants, Waking Gods is told via transcripts of interviews, lab notes, radio broadcasts, and military communications. It works beautifully. Focusing for a moment on the audio listening experience, I was blown away by the intensity of listening rather than reading. While the transcripts work well on the page, it's another thing entirely to listen to the talented narrators essentially act out each intense moment. 
 The audiobook is a full cast recording, so that each character has his or her unique voice, full of expression and personality. The unnamed narrator from the first book is back, and his voice in particular is odd but powerful. The rest of the cast is quite good (if you've read the books, you'll be happy to know that Mr. Burns is just perfect), and the listening experience brings a tension and immediacy to the action scenes. 
 Waking Gods is a thrilling follow-up to Sleeping Giants. I do, however, have one minor complaint. I thought this was a two-book project. I haven't seen anything anywhere referencing a 3rd. And it seemed as though Waking Gods finished the story (with an awesome climax, I might add)... until the very last moment, which took the concluding scene and turned it into a cliffhanger. So is there a book #3 on the way? So far, I haven't been able to find a hint of it online. 
 (view spoiler)[Spoiler territory: I feel compelled to add that I was absolutely devastated by the deaths of Kara and the unnamed man. Took my breath away. I get that you can't have a massacre on that kind of scale and have everyone we've come to know get through it unscathed, but Kara's death especially felt particularly cruel. (hide spoiler)] 
 I highly recommend both Sleeping Giants and Waking Gods -- and definitely recommend checking out the audiobook versions, if you're at all an audio person. Both books make for excellent listening experiences, and I was on the edge of my seat the entire time!