There's a lot going on in this thriller, which deals with brain implants, enhanced mental and physical skills, air pollution, global warming, archaeology, ancient secrets, conspiracy theories, and, oh yeah, aliens. The main characters are Ben, the CEO of the company that made the popular brain implants, and Sienna, a scientist who studies glaciers. Ben is suffering from amnesia after a brutal attack that injured him and left his girlfriend dead. Ben has been framed and goes on the run. Sienna's father is killed in a mysterious accident that occurred on the bottom of the ocean floor when his vessel was crushed while on a mission funded by Ben's company. Ben and Sienna suspect a link between the two events and set out to prove it. The more they learn, the higher the stakes become, until it's not only their lives that are at risk but the lives of the whole world. The plot is intriguing but confusing and busy at times as it unfolds on multiple scenes and involves multiple characters. But the threads come together more in the final third of the book and provide an exciting conclusion.