I'm not entirely sure as I haven't read it in detail. But generally, it might be about some spooky or mysterious events that take place in a place called Hotel Diablo. It could involve strange characters, maybe some sort of supernatural elements.
Well, from the name 'Hotel Diablo Graphic Novel', it gives the impression of a story set in a hotel with the name Diablo, which might imply something devilish or dark. It could be about the exploration of the hotel's corridors that hold hidden secrets. The graphic novel might use its visual elements to enhance the spooky atmosphere. There could be a protagonist who stumbles upon this hotel and then has to face all kinds of strange and dangerous situations that lurk within it, whether it's dealing with the hotel staff or uncovering the mysteries behind locked doors.