CREATE TABLE table_26400 ("Series #" FLOAT, "Season #" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT)

What is the highest series number of the episode 'Til Death do us part-and make it soon'?
SELECT MAX("Series #") FROM table_26400 WHERE "Title" = 'Til Death Do Us Part-And Make It Soon'
SELECT MAX("Series #") FROM "table_26400" WHERE "Title" = 'Til Death Do Us Part-And Make It Soon'