'Don't Bother to Knock' (1952) – Roy Baker.

This remarkably dark, psychologically dense thriller set over one especially fateful night in a bustling NY hotel is blessed with an unusually starry cast of glamorously glistering Hollywood icons; Richard Widmark, Anne Bancroft, Elisha Cook Jr, and a eerily off-key performance from a fresh-faced, soul-stirringly beautiful Marilyn Monroe, and masterfully directed by the genre genius behind evergreen horror classics 'The Monster Club' and 'Asylum'. A decidedly fragile young woman Nell Forbes (Marilyn Monroe) somewhat reluctantly agrees to babysit a young girl, a job offered to Nell by her no less twitchy lift operating uncle Eddie (Elisha Cook Jr.) but from her palpable anxiety, and increasingly erratic behaviour, childminding may not exactly be suitable employment for the melancholy, dreamy-eyed Nell!  'Don't Bother To Knock' is a deceptively profound thriller, with an engagingly humanist plot, commendable performances, and a satisfyingly deep well of humanity, successfully making for a singularly satisfying Noir-ish melodrama, with its uncommonly sympathetic, well-drawn characters, their entirely believable motivations maintaining strong interest throughout, and the exciting film's terrifically thrilling, nerve-racking finale remaining quite impactful to this very day, and on a more personal level, I found some of the interactions between Widmark & Monroe to be rather moving, and, for me, this is one of those rare thrillers that delivers far more than it promises!