Buffy, the Vampire Slayer: Gingerbread

When the bodies of two dead children are discovered in the park, Buffy's mom, Joyce, rallies the people of Sunnydale to track down their killers, but after Buffy, Willow, and Amy are tied to a stake in an apparent witch hunt, Giles learns that the dead childern are actually demons who feed off of people's mutual destruction of one another.