So, I have enjoyed this series of books. I like the characters and I like that the narrative of the series creates an alternative universe away from the typical trope which sets military thrillers in real modern contexts. That ultimately becomes a dangerous game because when you are injecting an unreality the potential for it becoming unbelievable to the reader increases. I think that is what happened in this book of the series for me. From the "new" types of submarines to the action involved throughout the book and certainly with the development of a new romance for the protagonist it all seemed rushed and not believable to me. I have no problem suspending disbelief, but this went to far for my taste. That being said I still breezed through it and will keep on reading this series so the damage inflicted was minor. You may very well have a different reaction and I would be remiss if I didn't mention that like the other books in the series this is a well written book.