In the historic Turkish city of Ruin, American journalist Liv Adamsen wakes up in an isolation ward. She knows she entered Ruin's forbidden ancient Citadel, but remembers only darkness. A strange whisper within says she is 'the key': but to what? For the desperate fanatics inside the Citadel, only her return can secure their survival. Charity worker, Gabriel Mann, meanwhile, believes Liv could unlock mankind's most profound mystery.