The door clicked, but it didn’t budge. Anna twisted the knob again, harder this time, but it remained stubbornly locked.

Anna stepped back, frustration coiling in her chest. Her eyes caught a black patch just below the doorknob, faintly glinting in the dim light. Curiosity surged, urging her to find out what it was.

Curious, she leaned closer and ran her fingers over the black patch. To her surprise, it moved beneath her touch. She lifted it and revealed a hidden keypad, a small grid of ...