During a visit to friends, Sara begins having visions and is attacked by an unearthly creature in her friend's swimming pool; she soon discovers that anyone who comes into contact with the water is in danger and she is driven to confront the mystical and malevolent creature lurking in the depths.

故事发生在囚犯袭击Elias Voit的六个月之后，他在暗网上的追随者开始在全国各地大肆搞破坏。为了阻止这个邪恶的组织杀害更多无辜者，BAU不得不与越来越难以预测、有自己目的的Voit进行合作。