The Circle is trying to discover what happened to Heather Barnes, the woman Zachary mentioned in the previous episode and what he meant.

While searching about her, they find out where his brother, Wade (Ben Cotton), lives and Cassie (Britt Robertson) and Adam (Thomas Dekker) go there to ask him about her.

When they get there, they discover that Heather (Camille Sullivan) is in a catatonic state since the night of the fire on the boat, sixteen years ago.

Wade tells them that she hadn't moved at all since then and the moment he says that, Heather grabs Cassie's arm.

Adam agrees to help her, after Cassie is telling him that she found her mom's Book of Shadows and there is a spell they can use.

Meanwhile, Diana is showing Adam what she found in her Book of Shadows about Heather's mark and that it's connected with demons and black magic.

All these leave the members of the Circle with more questions of what happened sixteen years ago on that boat and how their parents died and an unleashed demon that (in the form of a black snake) gets out of Heather's dead body and gets into Melissa's at the end of the episode.