Tom Cleverley scored in the 4th minute at Plymouth and it was enough to earn Watford three points.
Scott Loach produced a string of fine saves to keep out the desperate advances of the home side. Plymouth found themselves on the bottom of the Championship table after this defeat.
Nicking a goal and hanging on away from home is hard work for the weatching fans but the final whistle is one of the best sounds anywhere when it signals an away win.
Top marks to Loach, a stunning display.