Who was the writer for season episode 7?
CREATE TABLE "table1_27397948_2" (
  "no_in_series" real,
  "no_in_season" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "original_air_date" text,
  "u_s_viewers_millions" text
);
SELECT "written_by" FROM "table1_27397948_2" WHERE "no_in_season"=7;