From left to right, first we have "Circus of Fear" (1966) which is more of an English giallo than a horror (which isn't that surprising as it was written by Edgar Wallace) but I had to have it for Christopher Lee even though it's not exactly his greatest performance and you don't really see a lot of him in it.
Next, "The Hitch-hiker" (1953) is a very underrated film noir which, of course, is a precursor in many ways to "The Hitcher" (which we all know and love). If anything, it's a lot more tense than the Rutger Hauer vehicle and is supposedly based on a true story.
More film noir which borders on horror in "D.O.A." (1950) as a salesman gets poisoned and only has 24 hours to find out who did it and why. It's actually really good for the time although the plot has been done to death since.
Finally, "Detour" (1945) is kind of like "Very Bad Things" but without any comedy as a small time criminal falls foul of one of the most evil femme fatales ever and can't get away from her. Ann Savage is absolutely fantastic in it.
All of these public domain movies are quite highly rated on the IMDb and I almost bought a couple of Mill Creek's "mystery" packs to get them once. I'm glad that I saved my money though as these are the only titles on those packs which are any good anyway.