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In the first trailer for Sundance hit "Luce," a teacher (Octavia Spencer) accuses a star student (Kelvin Harrison Jr.) of threatening her.

Did he really cross a line or does she just have a vendetta against him?

It's another meaty role for Oscar-winner Spencer, who just headlined her first movie, the horror film, "Ma." (And we may never see her the same again after that!)

Julius Onah ("The Girl Is in Trouble") directed, based on the play by J.C. Lee.

Naomi Watts and Tim Roth play the boy's adoptive parents, who can't believe he's capable of anything dangerous.

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Harrison's credits include "It Comes at Night," "Assassination Nation" and "Mudbound."

Looks like one of those films you're going to be debating in the car on the way home.

"Luce" opens on August 2.

Watch the trailer:

[Via Collider]