CREATE TABLE table_2468961_4 (title VARCHAR2, written_by VARCHAR2, no_in_series VARCHAR2)

What was the title of the episode written by Julia Newton in series 48?
SELECT title FROM table_2468961_4 WHERE written_by = "Julia Newton" AND no_in_series = 48
SELECT "title" FROM "table_2468961_4" WHERE "Julia Newton" = "written_by" AND "no_in_series" = 48