About ではない, のか and など


I found this on my favorite seiyuu's IG. She's talking about a book.

> もちろん未知なお話だけど、もしかしたらユリゴコロは誰でも胸の中に眠っているのではないのか、など共感出来る部分もあったり。

My understanding of the sentence above is despite the book is unheard of, she
wants to tell us that the book (the content, the story, the feeling) is
actually in our heart and we can sympathize with it. But why she chose to use
ではない there? Or is it related to のか or など?

Also, what's the translation of that sentence? Thanks!




ではないのか is one phrase. It means "wonder","suspect". もしかしたら～ではないのか means "I
wonder that maybe ～."




ではないのか is one phrase. It means "wonder","suspect". もしかしたら～ではないのか means "I
wonder that maybe ～."

