It's in the Dark
Info: Horror Feature
Comps: Talk to Me, Hereditary. 
Logline: After five children aboard a 1920s Ocean Liner go missing, an Armenian solider haunted by massacre of his family in WW1 leads a group of parents to find them. However, deep within the bowels of the ship, a mysterious room leads them into an inescapable maze of infinite corridors where they are being stalked by otherworldly entities. 
Ishtar was written as a single-location horror set on the Queen Mary.