One possible theme could be mystery. The existence of the secret chambers implies there are things to be discovered. Another theme might be power. If the saintess has access to these chambers, it could be related to her power or a source of power. Also, there could be a theme of faith, considering the role of a saintess, which is often associated with religious or spiritual beliefs.
I'm sorry, I haven't actually read this novel specifically. But generally, a novel with such a title might involve a story centered around a saintess and some sort of mystery or secrets associated with chambers. It could potentially be a fantasy or historical - themed story where the saintess has a special role and the secret chambers hold key elements to the plot, like hidden treasures, ancient knowledge, or maybe something related to her powers.
Love is also a significant theme. The protagonist often has to balance his love life with his dangerous job in the secret service. There are complex relationships that add depth to the story.
Another theme could be trust. Since there is a secret involved, it's likely that the concept of trust among the characters is explored. For instance, if a character discovers another's secret, it could break the trust between them. Or perhaps the story shows how difficult it is to trust someone when you suspect they are hiding something. And also, the theme of discovery could be there. As the story unfolds, the discovery of the secret could be a major plot point, leading to changes in the characters' lives and relationships.
I don't know for sure as I haven't read the novel, but surely the fake saintess is one of the main characters. There might also be those who believe she is the real saintess, like some religious leaders or followers.
According to the given novel information, the following novelists were good at writing mechanisms, secret codes, and secret rooms: Black Horse River, Mo Jiu's keen mechanism thinking in "The Lonely King and Widow Daughter"; The Firefly Between the Feet, the dense puzzle-solving plot in "The Secret Room Can't Escape";; The rumor of the young master, the weaving and inheritance of the mechanism network in "Jinling Machine Master", etc. The above is my personal recommendation. I sincerely hope you like it ~
It could be an older woman, perhaps a widow, who has a long - held secret from her past that she has never shared. This secret could be related to her late husband or something she did in her youth.
There could be themes of self - discovery in'my secret stories'. Maybe the stories are about someone exploring their true self in secret, away from the prying eyes of society. Also, friendship themes might be present, such as a secret pact between friends that no one else knows about. It could be that these friends supported each other through tough times without anyone else being aware. This shows the depth and secrecy of their bond.
I'm not entirely sure as I haven't read this novel specifically. But generally, it might be about a girl who is falsely regarded as a saintess and she is waiting for a way out of this false identity, perhaps facing various challenges and intrigues along the way.
One possible theme could be displacement. If'send her back' is literal, it might be about a character being displaced from a place she's currently in. Another theme could be female identity. Since it mentions 'her', it might explore how a female character's identity is affected by being sent back. Also, power dynamics could be a theme, as the act of sending someone back often involves someone in a position of power making that decision.
Since I haven't read the novel, it's hard to say for sure. But based on the title, it might be about a secret that the main character has.