Zapped back in time to the dying days of Camelot, five teenagers risk everything to save a child who can change the future. When Guinevere summons Callie back to Camelot, Callie becomes trapped in time while her companions face Mordred on the bloody battlefield of Camlann. Callie's future depends on saving Ana, but death waits in the darkness for them all unless Callie can first save herself.