A 'last gasp novel' could refer to a novel that is the final work of an author, perhaps written near the end of their life or career when they are giving their last creative 'gasp' or effort. It might also be a novel that has a sense of finality or desperation in its themes or plot, as if it's a last attempt to convey something important.
One possible example could be 'The Last Tycoon' by F. Scott Fitzgerald. Fitzgerald was facing many personal and professional difficulties towards the end of his life, and this unfinished novel was his last significant work in the world of literature.
A 'gasp' in a graphic novel is often a visual or written indication of a character's sudden intake of breath in surprise, shock, or awe. It can be shown through the art, like a character's wide - open mouth, or described in the dialogue or captions.