I have a horrible memory for titles and names, but I recall seeing a lot of British suspense films in my lifetime. Some go back to the 1930s, but there are many more that were made in the 40s, and 50s. The Americans had a lot of good suspense movies during the same time period, but I tend to favor the British creations. Perhaps it is the fact that the settings and characters were different from places and people I know. Suspense films are not the same as mysteries, but the attention grabbing factors offer a similar thrill for me. Suspense gives you the "edge of your set" fright, while the mystery keeps your attention by trying to use clues to find the culprit. Hitchcock's Dial M for Murder is a great film when you see it for the first time. Don't research the story for fear there will be a spoiler tucked in somewhere. Another good one is Five Fingers. It's a true story embellished slightly to make a more interesting series of events. There is another film by the same name produced in the 1980s I believe. The one I am referring to was produced in the 1950s or 1960s following the publication of a book written by one of the true characters in the original story. It's a spy story that took place during WWII. It has wonderful intrigue. The old Sherlock Holmes films were good, but I sometimes couldn't follow the bizarre connections used to solve the crimes.
This is all I know - sorry I can't provide more details.