Let me check if there's a known book with a similar title. I know that "Escupir sobre tumbas" is a phrase that can mean something like "Spitting on Graves," which might be a metaphor for showing disrespect or anger towards the past. The user might be referencing a specific book or chapter they're studying for a class. If "Tumbas capítulo 22" is part of it, perhaps it's a chapter title in a larger work.