Titles that open with R
R is a wide shelf: revenge, rebirth, rejected mates, and "The Return of…". Revenge needs a ledger—what was taken, what would count as payment. Rebirth needs a divergence. Rejected mate needs a life after the refusal. Return needs a reason the first departure happened. If the title uses all four words, it is probably a keyword pile.
R is one of the letters where catalogs look "full" because revenge and romance both love this initial. Full is not the same as deep. Use the book page: chapters listed, synopsis with a situation, author name if present. Empty chapter lists are not readable books; we noindex those pages.
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.