The Fifth Book of All's Fair in Love and War finds Asia Monroe trapped in outer space. Outer space in the future. To make things worse, Leo Fitz, the man she loves, the man who has constantly been ripped away from her by fate, is not there beside her. Everything comes to a head when she looks out the window of the ship they are stuck on, and she sees a shattered fragment of the Earth with a glowing, orbiting orb of ice revolving around it. An orb of ice that seems to show her trapped inside of it.

S.H.I.E.L.D. has finally done what they never thought possible, what Fury never thought possible. Katherine Thorne joined them, but not only joining S.H.I.E.L.D., she became an Avenger. She was now a part of a team, full of people whom she never thought she would ever work side by side with, who fought for things she never thought she would ever believe in. But there is one thing Katherine believes in. Clint. Katherine believes in Clint. She never thought that she would ever be with him outside of her dreams, she never believed that she would ever find a place that she could call home. But she did. and that's with Clint. He makes her feel more alive than the power than runs through her bloodstream. He makes her question everything, he challengers her, but most importantly, he makes her happy. Something that she never thought she would ever be able to achieve. Clint has always saw the good in Katherine, always believed in her, and their love for one another has been through hell and back, overcoming the most impossible of obstacles but at the end of the day, their love is the one thing that really makes them believe that you can find a light even in the darkest of places. Katherine Thorne is finally ready for her happy ending with Clint. But with a new danger, threatening to destroy everything she's been dreaming of, can Clint and Katherine find their happy ending...? And with the discovery of a dark secret that threatens to tear down everything Katherine has dreamed of, everything that Clint and her fought for... will their love for each other be able to overcome that too... or will this be their breaking point..?