Scott Pfeiffer’s review published on Letterboxd:
Even if her true era was the '50s, Audrey Hepburn had a good year in '67, what with this and Two for the Road. She's very good as a young blind woman who proves more resourceful than anyone imagined in this gripping and entertaining thriller, based on a Broadway suspense play by Frederick Knott. It's got entertaining supporting performances from Richard Crenna, Julie Herrod as a smart young girl from (it's intimated) a dysfunctional family, and especially Alan Arkin as the head baddie. They do a lot with essentially one set. Terence Young was otherwise known for Dr. No and From Russia With Love.