In addition to books which present largely independent characters, certain stories feature men and women who are regularly partnered on adventures—often with an underlying romantic element. The Jaz Parks series, by Jennifer Rardin, follows the titular CIA operative and her vampire boss as they combat supernatural threats to national security. Jocelynn Drake's "Dark Days" novels follow a vampire named Mira and a vampire hunter named Danaus, who work together to protect their people from a mutual enemy. "Night Huntress", a series by Jeaniene Frost, centers on a half-vampire named Catherine and a vampire bounty hunter called Bones, who gradually become lovers while battling the undead.