They're all self contained stories. I've played a couple of the Carol Reed games. I like them. They are very quiet, not a huge amount of interaction, but it's there. They can be very linear. There's not a ton of voice work and at times the back tracking can get a bit annoying, but I can get over it (others may not). I like the location and the use of real people (it has a very unique graphical style) and the stories are interesting.
There are demos of all of them so you can see if they're your cup of tea.
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