Where to watch officially
RentAmazon Video
BuyAmazon Video
Availability data from TMDB / JustWatch. Links open the official provider listing.
Playback is proxied through Wheretoo — seek freely, the player only requests the parts it needs. Subtitles appear automatically when the source ships them.
A single mother signs up for self-defense classes from a handsome instructor. But he develops a frightening obsession with her and orchestrates an increasing deadly array of "tests" to see if she has truly learned from his lessons.