 This backfires as she becomes not a regular vampire, but one that has an occasional heartbeat and can only drink the blood of other vampires, absorbing some of their powers in the process.In "First Drop of Crimson" the book follows Bones' best friend Spade and Cat's best friend Denise as she tries to find a way to search for Nathaniel, a long-lost relative of hers.Over a hundred years ago, he sold his soul to a shape-shifting demon that has killed several of Denise's family members.