The creator of the long-running drama series “Pretty Little Liars” is reuniting with one of the show’s stars on a new project in development at ABC. Variety reports that “Liars” creator, exec producer and showrunner I. Marlene King received a put pilot commitment from the network for “The Heiresses.”

“Pretty Little Liars” alum Shay Mitchell is attached to star in the project, described as a family soap with a mystery twist. The show is set in the diamond world.

“The Saybrooks are a household name — they’ve been blessed with great fortune, but cursed with epic loss,” Variety reports. “The events surrounding a deadly accident a year ago drove a wedge between the once-inseparable diamond empire heiresses, but when an unspeakable tragedy brings the cousins back together, they create a truly unbreakable bond. They set to solve the mystery of who wants the Saybrook family dead before one of them is the next target.”

The project is based on the bestseller of the same name by Sara Shepard, who also wrote “Pretty Little Liars.”