We Have Our First Look At Blake Lively And Anna Kendrick In "A Simple Favor" And It's Seriously Mysterious

Gone Girl is shaking.

If you're a fan of Anna Kendrick or Blake Lively or most likely both, you'll probably know they're starring in a movie together called A Simple Favor, directed by Paul Feig, the man behind Bridesmaids and Freaks and Geeks.

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Well, the first full trailer for the movie just dropped, and it looks seriously cool and kind of creepy.

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In the trailer, we see Anna's character Stephanie and Blake's character Emily meet at their sons' school and start a friendship.

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But there's something more than a little ~off~ about Emily.

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Even though she dresses great.

After Stephanie receives a mysterious phone call from her friend, Emily suddenly disappears, and Stephanie makes it her mission to find out what happened.

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But then Linda Cardellini appears to tell Stephanie to back off, because there's something shady about Emily.

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And THEN we see a quick shot of Linda's character painting a portrait of Emily in thigh-high boots??? MYSTERY.

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Meanwhile, Emily is sending messages to Stephanie via her children.

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The trailer ends with several shots in quick succession – like Stephanie getting cosy with Emily's husband, a body bag being lifted out of a lake, and Emily's husband getting arrested.

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Gone Girl is shaking and I need to know more immediately!

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But we'll have to wait til 21 September to find out exactly what happened to Emily.