Romantic suspense is a subgenre of romance. Novels usually have a contemporary setting, and place independent heroines in dangerous situations. Narratives are fast-paced, often very sexy, and driven mainly by plot. Heroes are commonly alpha males, and the heroines are strong, thrill-seeking women. High-stakes circumstances bring them together.
Some writers in the genre, such as Tami Hoag and Lisa Gardner, have written both romantic suspense novels as well as pure suspense novels, depending on the balance between romantic and suspense elements in the books. Well-known writers include J.D. Robb and Lisa Jackson. A more recent example is Maya Banks' KGI series, about an elite, top secret, family-run business. If you write novels focused on romantic suspense, explore this subgenre to connect with other like-minded writers, workshop, and publish your book.