Heartsick - Chelsea Cain

This is a pretty good thriller about a cop that's obsessed with an imprisoned female serial killer named Gretchen. It's sort of a Silence of the Lambs thing except that the genders are reversed and Gretchen doesn't help him find the serial killer that he's currently looking for. It's not a real gripping or suspenseful story but it's an easy read and Gretchen is a very creepy character.