1979. Sixteen-year-old Carolyn Russell grows increasingly infatuated with her school mathematics teacher who is also giving her private lessons. Then she disappears.

2014. Struggling journalist Stephanie Brett creates a true-crime podcast focused on the disappearance of Carolyn Russell. By digging deep into this mysterious cold case, her confidence and flagging career are boosted. But after she confronts the suspects—and talks to a potential witness—the leads dry up. Nevertheless, she refuses to let the story rest...

Can a small-time journalist with a shoestring podcast really hope to reconstruct the ultimate fate of Carolyn Russell after all these years, or are some secrets best left buried?