The series centers on the conflict between a group of rebels from the year 2077 who time-travel to Vancouver, BC, in 2012, and a police officer who accidentally accompanies them. In spite of being many years early, the rebel group decides to continue its violent campaign to stop corporations of the future from replacing governments, while the police officer endeavours to stop them without revealing to anyone that she and the rebels are from the future.

After her mother dies in a fire, Cassie Blake moves in with her grandmother in the small town of Chance Harbor, Washington. As she gets to know her high school classmates, strange and frightening things begin to happen. They are all descended from powerful witches, and they've been waiting for Cassie to join them and complete a new generation of the Secret Circle. What they don't yet know is that darker powers are at play and that Cassie's mother's death might not have been an accident.

Sixteen-year old Raven Highgate is not your average teenager, she is a vampire and this is her umpteenth time attending a new high school to keep her identity hidden. But when a local cop reveals she knows Raven's secret and offers to introduce Raven to others of her kind in exchange for help catching a murderer loose in the school, Raven has no choice but to accept. . .but at what cost?