On last week's episode of The Secret Circle, viewers witnessed the power of Cassie's medallion.

It will be back at work tomorrow night, rest assured, as the girls of the coven gather for a creepy slumber party.

Look for Cassie, Faye and company to break out a Ouija board and be led around by the magical necklace. What does it spell out? Sacred. Why? Who the heck knows at the moment?!? Why are Melissa and Diana acting so giddy? That, we can guess.

Watch the sneak peek now and return tomorrow for an interview with star Jessica Parker Kennedy.

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.