CREATE TABLE table_23504 ("No. in series" TEXT, "No. in season" TEXT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "Production code" TEXT, "U.S. viewers  ( millions ) " TEXT)

Who wrote the episode titled 'Mission gone bad' 'Trapped in Paris'?
SELECT "Written by" FROM table_23504 WHERE "Title" = 'Mission Gone Bad" "Trapped in Paris'
SELECT "Written by" FROM "table_23504" WHERE "Title" = 'Mission Gone Bad" "Trapped in Paris'