At Lissa’s Halloween party, all hell breaks loose – literally.
Here's the story excerpt:

“Did you remember the cocktail sauce?” Lissa called to her roommate, who was still fussing with her costume in the bathroom.
“It’s in the bag on the counter.” Selena’s voice carried across the living room like a disembodied spirit.
A chill passed over Lissa. She had to stop this, it was ridiculous. She shook off the chill as she carried the platter to the table, but halted in fear. Out of the corner of her eye, dark shapes moved inside the mirror, escaped its confines, then soared to the ceiling. When she gasped and whirled to face it, the mirror was flat, static. The only image in it was hers.
That scared her more than anything.
She wasn’t even ready, and people would be showing up soon.