Blake Lively has been creating intrigue around her new film, A Simple Favor, for months, even wiping her聽Instagram account clean and leaving a cryptic message before returning to share the first teaser. Now we鈥檙e getting a deeper look at the mystery in the movie, which finds Anna Kendrick in over her head.

Directed by Paul Feig (Ghostbusters), A Simple Favor stars Lively and Kendrick as two mothers who come together thanks to their sons. After a playdate for the kids sparks a friendship between them, Stephanie (Kendrick) and Emily (Lively) become entangled in ways they couldn鈥檛 predict. While Stephanie is a mommy vlogger and online influencer, Emily lives a glamorous, sophisticated life.

The women begin to spend time together, and although Emily claims to want to hear Stephanie鈥檚 secrets, she won鈥檛 share any of her own and even demands that Stephanie delete a picture of her.

Even Emily鈥檚 husband warns Stephanie that no one can really get close to his wife, whom he calls a 鈥渂eautiful ghost.鈥 That may be prophetic, as Emily soon goes missing after calling Stephanie to ask for a simple favor.

The stars of the film spoke to at CinemaCon in April, and Kendrick teased some surprises. 鈥淚 love movies like this, like In Rouge or Kiss Kiss Bang Bang, where it鈥檚 definitely serious, the stakes are very real, it鈥檚 not a spoof, but it鈥檚 still funny,鈥 she said. 鈥淵ou know, it鈥檚 like a comedy and a thriller, it鈥檚 definitely both. But it鈥檚 not like it鈥檚 making fun of thrillers. It鈥檚 just awesome when it鈥檚 not really jokey, but you still have a big smile on your face the entire time even though you鈥檙e kind of gripping your seat because you don鈥檛 know what鈥檚 going to happen.鈥

Feig added that this is the Hitchcock-like story he鈥檚 been waiting to tell, saying that this movie 鈥減rovides lots of great twists and turns, but also two very fun, compelling characters.鈥

A Simple Favor also stars Henry Golding, Andrew Rannells, Linda Cardellini, Jean Smart, and Rupert Friend, and is set to open in theaters on September 14.

Are you intrigued by A Simple Favor? Let us know @BritandCo!

(photos via Peter Iovino/Lionsgate + Lionsgate)