In the damp heat of a southern summer, a young girl finds out that her family is moving to a new city. As Addie hatches a plan to stay put, she seeks solace in the mysterious lightning bugs in her backyard.
Lauretta's mother faints, falls on the floor while vacuuming and gets hospitalized. The 30-year-old cashier, alone in the apartment, finds an old letter among her mother's belongings - a letter that could have changed her life.