Carry On is a fantasy novel by Rainbow Rowell. Written for a young adult audience, Rowell shares the world of magic. Simon, known as the Chosen One, must save the magical United Kingdom from the evil Humdrum, who is bent on its destruction. The narrative explores themes such as the importance of love and friendship in life, the pursuit of truth no matter where it leads, and the realization that sometimes there is no happily ever after ending.