For years, rumors of the "Marsh Girl" have haunted Barkley Cove, a quiet town on the North Carolina coast. So, in late 1969, when handsome Chase Andrews is found dead, the locals immediately suspect Kya Clark, the so-called Marsh Girl. But Kya is not what they say. Sensitive and intelligent, she has survived for years alone in the marsh that she calls home, finding friends in the gulls and lessons in the sand. Then the time comes when she yearns to...

Cyber-security engineer Elliot Anderson, along with the titular character and fsociety, starts a revolution to change the world. Season four will pick up where the third season finale left off, delving into the pros and cons of Elliot hitting ₁send₂ on the email that could reverse Five/Nine.