Maddy pulled into a parking spot at the local grocery store and checked her list before she walked inside. She finished quickly and returned to her car, unlocked the trunk, and loaded it with bags.

After pushing the cart out of the way, she hurried to the driver's side, thinking about everything she had to do. Startled to find the door slightly open, she stepped back. A shiver slid down her spine, and she clutched her hand to her chest and glanced around the parking lot. Only ...