user: Question: What is the number in series for the episode title  "Crossroads"?
Columns: ['No. in total', 'No. in series', 'Title', 'Directed by', 'Written by', 'Original air date']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['27/28', '1/2', '"Into the Mystic" / "The Crucible"', 'Tony Tilse', 'Felicity Packard', '11April2010']
SQL:

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