This is my favorite book of Marie Lu's since her original Legend trilogy! I feel like the book's description didn't do it justice, as I was uncertain how much I'd enjoy it going it, but it only took a few pages for me to wonder why I'd waited so long to read it. The Strikers reminded me of Attack on Titan a little bit. The heroine's inability to speak (not from birth, but since her home nation was invaded) was an interesting twist to her character development, especially as more about her backstory is revealed. The arrival of the "mysterious prisoner" is referenced only briefly in the description, but that's when the book really starts to take off. I don't want to spoil anything, but the evils and technologies developed by the Karensa Federation take center stage and provide an interesting exploration of what CAN be done with the science left behind by an ancient civilization, versus what SHOULD be done.