Joan has always done the right thing, both as a palliative care doctor and as a caregiver for her widowed mother, Sheila. Joan's adventurous sister, Vivien, is a different story. She left home, running from an insecure childhood troubled by an alcoholic father and unstable mother. Still, when Vivien learns that their mother is seriously ill, she reaches out to Joan. She's heading for a remote village where Ebola is spreading, and she's afraid she may die. If she does, she wants Joan to pose as her online so her dying mother won't have to grieve a daughter. Joan reluctantly agrees, figuring it will never come to that. But Vivien does die. And even as Joan mourns her sister, she begins to impersonate her online, as promised. To her surprise, posing as Vivien becomes liberating, even addictive. Then she receives a message on her sister's Facebook from a man claiming to be the son Vivien gave up for adoption, and the line between right and wrong, adventure and tragedy, really begins to blur...