If no GFCI and if it's backstabbed outlets you could put a light in one outlet and then push on each of the other outlets with your thumb while looking for the light to flicker, then repeat for each outlet, 20 tests in all.
But, the bad connection could be at a working outlet just upstream of this string that feeds this string. So it helps to know which outlet is upstream of which (the outlet at the end will have only one cable in its box).
Last edited by Wuzzat?; 06-14-2014 at 06:50 PM.