At long last, Finn was granted the gift of maturity, but a gift received out of pain and labor. Now, dedicated completely to the needs of the many rather than his own doused heart, his heroic skills have been called upon to aid the land of flames. How far will he go to protect the Fire Kingdom, and will he be willing to give himself one last chance with its ruler?

Now 17, Finn the Human has become a mature hero of Ooo. However, repressed feelings for Flame Princess are desperately trying to tear him apart, and the fiery girl knows his pain. As an ancient evil rises to consume all existence, a final chance will present itself to Finn and his friends to not only stop the madness but finally unite a couple struggling for each other's love.

Set after Red Throne, Finn's depression has forced him to take drastic measures. Four years later, he copes with his emotions by becoming a full-time hero. Ooo's Kingdoms have lived in harmony and crime is at an all-time low as a result. However, conflicts loom in the distance and the human is led into a journey of redemption, friendship, and love.

What has happened to Finn? Perhaps the only person to know the answer to this question is Finn himself. The years have been hard on the young human but they have taught him many lessons. What happens when his path once again crosses that of the King of Flames herself? What will happen when someone else learns what he has been through?