CREATE TABLE "table1_27823058_1" (
  "series_num" real,
  "episode_num" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "original_air_date" text
);

Question: Which episodes did Katie Palmer write? 
SQL: SELECT "title" FROM "table1_27823058_1" WHERE "written_by"='Katie Palmer';

Question: What's the highest series number ? 
SQL: SELECT MAX("series_num") FROM "table1_27823058_1";