CREATE TABLE table_1701 ("Series #" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "U.S. viewers  ( million ) " TEXT, "Original airdate" TEXT, "Production Code" FLOAT)

When debra j. fisher & erica messer are the writers and the director is patrick norris what is the series number?
SELECT "Series #" FROM table_1701 WHERE "Directed by" = 'Patrick Norris' AND "Written by" = 'Debra J. Fisher & Erica Messer'
SELECT "Series #" FROM "table_1701" WHERE "Directed by" = 'Patrick Norris' AND "Written by" = 'Debra J. Fisher & Erica Messer'