Power distribution to outlets is usually daisy chained from the breaker out to the multiple outlets. A loose hot or neutral at an outlet will dump power to anything further down stream just like a GFI loop. I would start pulling outlets and check the hardware for a tight fit. Also check the neutral line. You actually could have power present but if the neutral is open you won't have current flow so be careful you don't become the return path. Also check the neutral hardware in the breaker panel.
A very useful tool that will help speed your efforts is a non-contact voltage tester. Won't tell you how much power is present only that something is there. $15 or so at you favorite big box store.