Whats creepy is Rachel spied Megan Hipwell (Haley Bennett) before she went missing.

Why are you here?

Rachel is asked by a voice that sounds like Theroux.

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Because Im afraid of myself, she tearily replies.

Blunttold reportersin Jaunary that the role was the most challenging thing Ive ever done.

And director Tate Taylor was candid about the heroines state of mind.

You cant avoid the puns with this movie shes a trainwreck,he told EW last December.

The film is adapted from Paula Hawkins debut novel, which wasAmazons top-selling book of 2015.

EWawarded the novel an A-.

See the trailer, scored to a slowed version of Kanye Wests Heartless, above.

The Girl on the Trainopens Oct. 7.

This post has been updated after its original publication.