CREATE TABLE table_24313 ("Episode" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Originalairdate" TEXT, "Viewing Figures  ( millions )  Sourced by BARB ; includes ITV1 HD and ITV1 +1" TEXT)

What is the episode number for 'case two (part 1)'?
SELECT "Episode" FROM table_24313 WHERE "Title" = 'Case Two (Part 1)'
SELECT "Episode" FROM "table_24313" WHERE "Title" = 'Case Two (Part 1)'