This is a fun, action pack, page turning, spy and political thriller. Think James Bond, Jason Bourne or Mission Impossible with actual real world consequences. 
 Like a good sequel it doesn't retell the same story, but explores a different area while keeping the spirit, characters and style of the original. With multiple characters views we get a wider look of a modern world influenced by two warring yet secret alien societies. 
 Roen is now an experience secret agent, Jill's his estranged wife an undercover political operative in Washington. Both are hosts to symbiont aliens (think voices inside your head being alien mentors) that have been influencing earth history in secret for million of years. The enemy now has a new leader who is highly skilled, fanatical and doesn't follow conventional rules of honor. Roen and Jill struggle to make sure their son has a future and their relationship. 
 Consequences from the first book are explored, both the personal sacrifices and losses. Actions have consequences, getting into fights have physical consequences, killing someone psychological and choices will often come back to haunt them. The story doesn't hold back and isn't afraid to do what you don't expect. Saying the characters are flawed and that things don't always go according to plan is an understatement. 
 The real strength is the host-symbiont relationship, Roen and Tao's banter is often humorous and entertaining, offering comic relief and extra character insight. 
 Some of the romance conflict got tiring and cliche. Will Jill fall for the charming James Bond like bodyguard or go back to her husband. There rarely any doubt which way it will turn, but guys may get some hints on being a gentleman. 
 Personally, after reading so much fantasy and science fiction it was refreshing to read something still sci-fi but takes place in modern times. 
 I enjoyed this so much and the ending despite being satisfying left more questions and was unexpected that I broke my rule about not reading series in a row and started the third book right away.