First test for a tripped gfci. If not then what you do is turn off the breaker for that circuit and open each box for that circuit and check for wires that came off the terminal or back wired"push in" connections that came off. Just make sure you turned off the correct breaker and check for power before you touch anything.Get yourself a non contact voltage tester they come in handy.

Not too long after we moved into Pandora's House, we had several outlets go dead, along with all the lights in the bedrooms. It nearly drove us nuts trying to figure it out until my uncle pushed the gfci in the bathroom. The guy that wired the fans and new plugs, put them all together. May not be your issue but it helped us when we thought outside the box (no pun intended).