So yeah, Nightingale's really not horror at all (though plenty of horrific things happen), but a period war drama/revenge story. It's kinda reminiscent of Bone Tomahawk or The Missing, where you have an unlikely team venturing through treacherous, newly-settled/colonized land whose indigenous people are still fighting to keep. Really solid performances from everyone involved (cool to see the actor who briefly appeared as Charles Manson in Once Upon a Time in Hollywood get a significant role) - the main female protagonist, her indigenous companion, and the main villain were particularly good. Definitely recommend it from a historical & storytelling standpoint.
Obviously it's wildly different from The Babadook, but there is one particular scene - a dream sequence - which mirrors a scene in The Babadook (a male character, who the female protagonist has seen die, stands in the shadows and creepily repeats the same line over and over).
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I wasn't even home. I was playing Magic the Gathering at my buddy's store, which is extremely easy to verify