A bouncer with a slightly murderous anger-management problem that she controls with the help of an electrode-lined vest she uses to shock herself back to normalcy whenever she gets homicidal. After the first guy she's ever fallen for is murdered, she goes on a revenge-fueled rampage to find the killer while the cops pursue her as their chief suspect.
Voldemort is tightening his grip on both the Muggle and wizarding worlds and Hogwarts is no longer the safe haven it once was. Harry suspects that dangers may even lie within the castle. Together with Dumbledore they work to find the key to unlock Voldemort’s defenses and, to this end, Dumbledore recruits his old friend and colleague, the well-connected and unsuspecting Professor Horace Slughorn, whom he believes holds crucial information. Meanwhile, the students are under attack from a very different adversary as teenage hormones rage across the ramparts.