The main characters will be trying to cover up -- spoiler alert here -- the death of Perry Wright, played by Alexander Skarsgard, Vogue reported.
Streep will play Wright’s mother, the magazine reported.
In the trailer, Streep shows her suspicions as she speaks with Witherspoon.
"My son is dead. I want to know what happened that night," Streep says in the trailer. "I'm very tempted to ask you, but I don't think I would get the truth, would I?"
The plot is based on the best-selling book by Liane Moriarty, according to CNN.
Here is the trailer: