A new trailer for the upcoming thriller "The Girl on the Train" doubles down on the madness encircling protagonist Rachel (Emily Blunt), who thinks she's seen something terrible happen to a young woman -- but may have been more involved in the crime than she actually remembers.'The Girl on the Train' (2016) Trailer

Much like the first trailer, this new promo sets an eerie mood, echoing Rachel's own sense of foreboding as she begins to discover the connections between herself, her ex-husband (Justin Theroux), and the missing woman (Haley Bennett), who turns out to be her ex's nanny. We see several scenes of Rachel trembling as she washes something dark off her hands (is it just dirt, or maybe blood?), and nurses some serious looking bruises and scratches covering her back.

A weeping Rachel admits, "I'm afraid of myself," and based on what we've seen from the flick so far, it's not difficult to understand that feeling. The why of it, however, remains an intriguing mystery for now.

"The Girl on the Train," based on the novel by Paula Hawkins, also stars Rebecca Ferguson, Luke Evans, Allison Janney, Edgar Ramirez, Lisa Kudrow, and Laura Prepon. It's due in theaters on October 7.