I'm not sure specifically as I haven't read it. It could be about various things. Maybe it has a science - fiction theme related to ultraviolet light, like some sort of adventure in a world where ultraviolet phenomena play a major role.
Since I don't have a copy of the 'ultraviolet graphic novel' in front of me, I can only guess. It might center around a group of characters who are involved in some sort of scientific research related to ultraviolet. Their research could lead them into dangerous situations or uncover secrets that change their lives. It could also use the ultraviolet concept as a metaphor for something deeper, like the hidden or unseen aspects of life, with the graphic format helping to bring out these ideas in a vivid and engaging way.