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I Think We're Alone Now poster (courtesy Momentum Pictures)

Elle Fanning crashes Peter Dinklage's post-apocalyptic peace in I Think We're Alone Now trailer

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Aug 29, 2018, 4:26 PM EDT

Just when he thought he was the last man on Earth, Peter Dinklage gets a surprise. In the official trailer for the upcoming film I Think We're Alone Now, the Game of Thrones star's character discovers that he's actually not the sole survivor of a mysterious apocalypse.

Elle Fanning shows up in his decimated small town as Grace, a mysterious teenager whose company Dinklage's Del doesn't seem interested in keeping. A former librarian, he appears content in his solitude, spending his time methodically burying (and cataloging) the bodies of his neighbors and, true to his profession, returning their overdue books to the library.

The trailer plays up the uncomfortable dynamic between the two characters — he's a quiet loner (perhaps even happier than he was pre-apocalypse) and she's a jumpy, attention-craving extrovert. The tension begins to rise when it's implied she has a dark secret. "I have to tell you something," she says, hauntingly. "It's about where I came from."

A series of mysterious voice-overs deepen the suspense: "It's time for you to come back home," one declares. Could they be survivors? Or just memories?

Check out the trailer above, but be warned, it does not feature either Tommy James & Shondells or Tiffany's versions of the iconic the namesake pop song.

I Think We're Alone Now, which debuted at the Sundance Film Festival earlier this year, was written by Mike Makowsky and directed by Reed Morano, who won an Emmy last year for directing The Handmaid's Tale. The film opens in New York and Los Angeles on Sept. 14 before a wider release and on-demand availability one week later.