user: Question: What's the series number of the episode titled "Rapture"?
Columns: ['No. in series', 'No. in season', 'Title', 'Directed by', 'Written by', 'Original air date', 'Production code', 'U.S. viewers (millions)']
Types: ['real', 'real', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: [412.0, 1.0, '"Rumble"', 'Constantine Makris', 'Christopher Ambrose & Richard Sweren', 'November 5, 2008', 19003.0, '7.85']
SQL:

assistant: SELECT "No. in series" FROM "Table" WHERE "Title" = '"Rapture"';