The Chilling Trailer For Blake Lively's A Simple Favor Stirs Up a Tantalizing Mystery

A new look at Blake Lively and Anna Kendrick's new film, A Simple Favor, is here, and oh boy — this is gonna be good. The Paul Feig-directed thriller stars Kendrick as Stephanie, who seems like she just wants to track down her missing BFF Emily (Blake Lively) . . . but what if she actually had something to do with her disappearance?

Although Emily has always seemed like an elegant, aspirational, and all-around put-together human being, she's also been hiding a dark side from both Stephanie and her own husband, Sean (Crazy Rich Asians actor Henry Golding), which creates an even more complex mystery. "Five days ago, Emily went missing," Kendrick says in a voiceover in the teaser, below. "I'm realizing I don't know her as well as I thought I did."

Watch the latest trailer above before it hits theaters on Sept. 14.

Teaser 2:

Teaser 1: