user: Question: What is the ISBN of "Dead as a Doornail?
Columns: ['#', 'Title', 'Publisher', 'Release', 'Length', 'Hardcover', 'Paperback']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'Dead Until Dark', 'Ace Books', 'May 2001 (paperback) January 2008 (hardcover)', '291 pp', 'ISBN 0-441-01597-2', 'ISBN 0-441-00853-4']
SQL:

assistant: SELECT "Paperback" FROM "Table" WHERE "Title" = 'Dead as a Doornail';