The screenplay is by Rebecca Sonnenshine, based on the bestselling novel by Freida McFadden.
Hidden Pictures Todd Lieberman will produce, and the companys Carly Kleinbart Elter will oversee the project.
Feigcos Feig and Laura Fischer are also producing.
(L-R) Sydney Sweeney, Amanda Seyfried and Paul FeigGetty Images
Sweeney and Seyfried will serve as executive producers alongside Alex Young and McFadden.
She soon learns that the familys secrets are far more dangerous than her own.
It also has a record-breaking half-billion pages read on Kindle and is the No.
2 most-read title for Kindles 10th anniversary behind only the Harry Potter series.
Chelsea Kujawa and Erin Jones-Wesley are overseeing for Lionsgate.
Robert Melnik negotiated the deals for the studio.
Sweeney is repped by Paradigm and Stewart Brookman and Hansen Jacobson Teller Hoberman.
Seyfried is coming off her Emmy-winning role in the Hulu seriesThe Dropout,where she played Elizabeth Holmes.
She is repped Innovative and Frankfurt Kurnit Klein & Selz.
Feig just directed and produced the Amazon filmJackpot!, a global success having stayed No.
1 worldwide on Amazon for four consecutive weeks.
He is represented by CAA and Sloane, Offer, Weber, Dern.
Sonnenshine is repped by Circle Management + Production and UTA.
