         case isbn = "isbn13"
         case authorIntroduction = "author_intro"
         case summary
+        case series
     }
 }
 // MARK: Inner Struct Defines

    let isbn: String
    let authorIntroduction: String
    let summary: String
}

// MARK: CodingKey

        let title: String
    }
    
    struct Series: Codable {
        let seriesID: String
        let title: String
        enum CodingKeys: String, CodingKey {
            case seriesID = "id"
            case title
        }
    }
}

