She used the key and stepped inside. To avoid alarming the lone custodian, she ignored the light switch and allowed her eyes to adjust to the dusky room. The primer was in the bottom drawer, and she darted to her desk and snatched it out, releasing her pent up breath. When she straightened, a shadow covered her as a hand grabbed her arm. Her scream froze in her throat, and her knees buckled when a stick rose above her head.
Storms are good and camping is good.
You can add excitement and suspense to a story when you add scenes like this. So - we have characters and we have settings. Here are some techniques that will also help you. Do not put all your backstory out right away. Tell only the tiny bit that needs to be told.