For all authors from CA who are not on contract, which title of his/hers has the most year to date sales.
year to date sales refers to ytd_sales; on contract refers to contract = 1
SELECT T1.title FROM titles AS T1 INNER JOIN titleauthor AS T2 ON T1.title_id = T2.title_id INNER JOIN authors AS T3 ON T2.au_id = T3.au_id WHERE T3.contract = 0 AND T3.state = 'CA' ORDER BY T1.ytd_sales DESC LIMIT 1