Some doors are best left closed in the trailer for Do Not Open, which stars real-life spouses Shawn Ray and Marisol Ray.

Part slow-burn psychological horror, part Hitchcockian suspense thriller, the indie film will be released on Digital March 10 via Cleopatra Entertainment.

It follows a married couple in their 50s who retreat to a secluded vacation cabin, hoping to mend their strained relationship. From the moment they arrive, they are given one rule: the door at the end of the hall is strictly off-limits.

At first, the husband is mildly...