The party was supposed to be all in good fun . . . until a killer showed up uninvited.

Halloween has been Ariana's favorite holiday since she was little, and this year is no different. As she plans a huge neighborhood bash, things take a drastic turn when her friend Bella shows up, scared for her life.

Ariana and Damon never turn away someone in trouble, but this time it might put them in harm's way. They do their best to keep Bella hidden, but the unhinged murderer won't give up his search. And he's getting closer.

Bella promised she would stay away from the Halloween party, but the festivities prove too much of a temptation. Surely nobody would recognize her if she wore a mask . . . Except the killer would know her anywhere, in any disguise.

Will Ariana and Damon be able to protect their friend and save their own lives?