Amy Berg is set to make the move from documentaries to a narrative feature with a big-screen adaptation of Laura Lippman's Every Secret Thing. Variety has the news, adding that Diane Lane has already joined the cast. The book, published in 2004, is officially described as follows:

Two little girls banished from a neighborhood birthday party take a wrong turn down an unfamiliar Baltimore street—and encounter an abandoned stroller with an infant inside. What happens next is shocking and terrible, and three families are irreparably destroyed.

Seven years later, Alice Manning and Ronnie Fuller, now eighteen, are released from “kid prison” to begin their lives over again. But the secrets swirling around the original crime continue to haunt the parents, the lawyers, the police—all the adults in Alice and Ronnie’s lives. And now another child has disappeared, under freakishly similar circumstances...

The tale is not too far a cry from the tragic reality that was the focus of Berg's recent documentary, West of Memphis, detailing the two-decade struggle of the West Memphis Three.

Lane, who will play one of the girls' mothers, recently appeared in Secretariat and will next play Martha Kent in Zack Snyder's Superman reboot, Man of Steel.