CREATE TABLE table_28118 ("Series #" FLOAT, "Season #" FLOAT, "Title" TEXT, "Director" TEXT, "Writer ( s ) " TEXT, "Airdate" TEXT)

Who was the writer of episode 15?
SELECT "Writer(s)" FROM table_28118 WHERE "Season #" = '15'
SELECT "Writer(s)" FROM "table_28118" WHERE "Season #" = '15'