I might be way off base with this observation, but there seems to be an undercurrent of something akin to homoeroticism in the dynamic between John Dall as "Brandon" and Farley Granger portraying "Philip," within this somewhat awkward story that functions less as a puzzle and more like a display of arrogance. The two characters, after committing murder against their college acquaintance "David," host a dinner party for some guests, which highlights them—particularly Dall—as unpleasant individuals with an unwarranted sense of importance. As their disagreeable nature is amplified by self-assurance and alcohol consumption, their former schoolteacher "Rupert" (Jimmy Stewart) begins to suspect that there’s more to the disappearance of “David” than initially appears obvious – a suspicion heightened by the arrival of David's father, Sir Cedric Hardwicke. He soon starts connecting the dots. I thought the extended camera shots were quite successful in creating suspense, though the constant stream of dialogue became tiresome, and for me at least, the boundary between developing characters and provoking annoyance was definitely blurred. If Dall’s intention was to make viewers feel uncomfortable—both within the room and as an audience—he certainly achieved it; and as mentioned in the promotional material, this is one movie you won't easily shake from your memory.

Source on TMDB