CREATE TABLE table_18481791_3 (title VARCHAR2, us_viewers__in_millions_ VARCHAR2)

What is the title when u.s. viewers (millions) is 3.97?
SELECT title FROM table_18481791_3 WHERE us_viewers__in_millions_ = "3.97"
SELECT "title" FROM "table_18481791_3" WHERE "3.97" = "us_viewers__in_millions_"