Titles that open with D
D often means "The Daughter of…", "Divorce", or "Double". Identity plots like to live here: a hidden heir, a second face, a life that has to be disowned. The test is whether the double life has a cost in public. If nobody in the story would notice the secret, it is costume jewelry.
Dark-romance readers sometimes start in D because of "devil", "dangerous", and "dominance" language. Read the book page synopsis for who holds power and whether leaving is possible. If you cannot tell, the listing is too thin to trust.
This is a title index, not a ranked list. Reading guides and categories are better when you want a story type instead of a letter.