Can someone bring me up to speed on The Secret Circle?

Witness: Jake's back in Chance Harbour and convinces Cassie to do a spell with him that will help them discovered what really happened in the fire that killed all their parents. The spell enables Cassie to enter Jake's memory, who was at the boat fire when he was very young. Cassie finds out that her father wasn't killed by the witch hunters, but actually escaped. He is still alive by use of a medallion that holds dark magic. Cassie goes to the boat yard and finds the medallion. Meanwhile, Faye meets a friend of Lee's, who gives her "Devil's Spirt", a kind of (dangerous) drug that strengthens power. Ethan now has the crystal after taking it from Charles.

Mellalion: Cassie is warned by a psychic who knew her parents that the witch hunters were after her. Cassie confides in the psychic about the medallion, and the psychic assures Cassie she knows how to activate it. The psychic was marked by Faye's mother, and is forwarned of her return. Dawn wants the psychic's help to find more crystal's, but is killed by the psychic (who is actually working for the witch hunters), and then meets the Circle in the woods to "activate" the medallion. But instead of activating it, the spell she tells them to recite starts to take their powers. Cassie turns on the psychic, using the medallion's magic against her, and tells her never to return. The pyschic reports back to the witch hunters who kill her. Charles takes back the crystal by drugging Ethan, and revives Dawn. Cassie makes it clear that she likes Adam more than Jake after finding out that Jake has killed witches. In his misery, Jake invites Faye over and they have sex.

Valentine: Faye hosts a girl-only, anti-valentine's day slumber party at her house, where Melissa and Diana sample some of the devil's spirit drug. Melissa over-doses and gets sick. Meanwhile, Cassie is seeing ghosts that are attached to the medallion, having taken the power of said dead witches. Cassie soon finds out how dangerous the medallion really is when it tries to choke her to death while driving to Adam's. She flips the car, and is lured to an old church where the witches were killed by her father. Adam and Jake rush to her rescue. Adam is possessed momentarily by the ghosts, and they threaten to kill their host if Cassie does not hand over the medallion. Jake screams at her, begging her not to give the medallion to the ghosts, but Cassie feels she has no choice. The ghosts are making Adam slice his wrists open. So instead, Cassie crushes the medallion in her hand which releases Adam from the ghosts. Back at Adam's boat, Cassie finds a Valentine's day supper prepared for her, and Adam and Cassie share another kiss.

These are just quick summeries. More things happened, but they weren't crucial, so I left them out. Hope this helps!