CREATE TABLE "table1_2618142_1" (
  "no_in_series" real,
  "no_in_season" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "original_air_date" text
);

Question: name the title of the episode that ed sherin directed.
SQL: SELECT "title" FROM "table1_2618142_1" WHERE "directed_by"='Ed Sherin';

Question: the first episode in this season had what number in the series? 
SQL: SELECT MIN("no_in_series") FROM "table1_2618142_1";