Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_23242933_2 ( no_in_series INTEGER, written_by VARCHAR )

### Question ###
What's the series number of the episode written by Dan Vebber?

### Accurate SQL ###

SELECT MAX(no_in_series) FROM table_23242933_2 WHERE written_by = "Dan Vebber"