Blood of innocence

"Searching for a suspect who murders his female victims at night, draining their bodies of blood, FBI agent Sloan Sky soon discovers what the killer is really after, forcing her to break all the rules and face her deepest fears."@en
"Gifted profiler Sloan Skye joins the hunt for an elusive serial killer--and discovers a breed of criminal few know exists?A cynic by nature, Sloan Skye wasn't thrilled when she was assigned to the FBI's Paranormal Behavioral Analysis Unit. But her doubts are slowly easing, especially when she sees that working on the fringe allows her to use some of her more unconventional tactics. Most of all, Sloan's grateful her career is on track--because her love life, if you can even call it that, is in shambles. Sloan is searching for a suspect who slays his female victims at night, and bizarrely drains their bodies of blood. Bad enough, but when Sloan learns what the killer is really after, she can barely sleep at night. When the suspect guns for someone very close to Sloan, it's time to throw out the rules and face her deepest fears?"