Invisible City

The concept of a secret city lurking beneath our own is so intriguing. I'm curious whether this idea came from folklore, personal experience, or pure imagination.

The bonds between the characters added so much warmth to the story, but I wonder if the author drew from personal experiences or observations about friendship.

The pacing kept me hooked without feeling too intense or too slow. I'm interested in how the author planned this balance to suit younger readers' appetites.