I'm not sure if 'the deepest secret a novel' is popular. There are so many novels out there, and without more information or widespread recognition, it's difficult to say it's popular.
Well, sharing 'my deepest secret story' is important in many ways. For starters, it can be a form of self - acceptance. When you share something that has been hidden deep inside, you are acknowledging that part of yourself. Moreover, it can inspire others who might be going through similar situations. They can see that they are not alone in their struggles.
The title 'the deepest secret a novel' is quite intriguing. It makes me think that this novel might be centered around a secret that is not only difficult to discover but also has profound implications for the characters. It could be a psychological exploration of how people keep secrets, how they are affected by them, and what happens when those secrets are finally revealed. The 'deepest' part might suggest that it goes to the very core of the characters' beings or the fabric of the story's world. There could be themes of guilt, redemption, or self - discovery related to this secret as well.
One book that might be similar is 'The Secret Keeper' by Kate Morton. It has elements of mystery and secrets within families, much like what 'the deepest secret novel' might imply.