I looked up 'Darkest Whisper' and honestly, there are a few books with that title floating around, so it's a bit tricky to pin down which one you mean. The most common reference seems to be to a romance novel, possibly a paranormal or dark fantasy one. In those contexts, the protagonist is often a human woman who gets entangled with some supernatural, brooding male lead—maybe a vampire, demon, or fallen angel. Her goal usually revolves around survival, uncovering a mystical secret, or navigating a forbidden attraction that puts her at odds with a powerful, dangerous entity. It's a familiar setup in that niche.
If we're talking about something else, like a web serial or an indie dark fantasy, the protagonist could be entirely different—a rogue, a mage with a cursed power, or even an anti-hero seeking revenge. Their goal might be to silence a literal 'darkest whisper' plaguing their mind or to conquer a throne. Without the author's name, it's hard to be definitive. My guess, leaning on the romance angle, is a female lead trying to understand or escape a fate bound to a supernatural force, with the central conflict being her struggle for autonomy amidst escalating supernatural dangers.