CREATE TABLE table_1807 ("No. in series" FLOAT, "No. in season" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "Prod. code" TEXT, "Viewers  ( millions ) " TEXT)

What's the series number of the episode originally viewed by 4.1 million people and written by Douglas Lieblein?
SELECT "No. in series" FROM table_1807 WHERE "Viewers (millions)" = '4.1' AND "Written by" = 'Douglas Lieblein'
SELECT "No. in series" FROM "table_1807" WHERE "Viewers (millions)" = '4.1' AND "Written by" = 'Douglas Lieblein'