It was recently announced that former Buffy the Vampire Slayer actress Sarah Michelle Gellar will star in the pilot.
Peter Traugott told Entertainment Weekly: "It's an edgy thriller about redemption and about revenge. There's a point of view of two twin sisters who grew apart over a tragedy in their past. And one now seeks redemption and the other one seeks revenge."
He explained that one twin, Bridget, will assume her sister Siobhan's life following her death in a boating accident.
"Sarah's playing both roles," he confirmed. "[Bridget is] living the life of her more successful sister only to come to find out that her life is equally as fraught with danger and complication."
Traugott also revealed that the show will explore Siobhan's life before her death, comparing the storytelling approach to legal drama Damages.
"Damages tells part of the story in the present, through the past," he said. "Not just flashbacks, but through actual stories in the past. That's what's happening here."
Ringer is being written by Eric Carmelo and Nicole Snyder and will air its pilot episode later this year.