The story will mainly tell that Olivia Warren (played by anna torv), a young female FBI agent, is ordered to join the secret department code-named "Edge" and cooperate with the enigmatic mysterious scientist Dr. Walter Bishop (played by john noble) to investigate a series of supernatural phenomena that cannot be explained by science. As these phenomena become more and more serious, they gradually find that some troubles may be caused by Walter Bishop's own research, while more troubles are related to Prometheus, the top secret research institution ... The truth is revealed bit by bit, but the secret is getting deeper and deeper.