This cover is called Behind The Locked Doors.

"Name" was a curious person. One day, "Name" found a mysterious set of locked doors. Day after day, week after week, "Name" thought about the doors. One day, "Name" finally decided to check them out. And "Name" never came back.

"Different Name" was also a curious teenager. Years had passed since "Name" had left for the doors and never came back, and yet, the doors still remained locked. "Different Name" wanted to see what went on there. He/she went to see the locked doors. What will happen? Will "Different Name" make it out alive?

The category is mystery/thriller.