I grew up in a household of old movie buffs - particularly mystery & horror. In fact, my parents have an entire room of their home devoted to a library of old mystery novels & film books.
That said, it's not surprising that I married a man also interested in old films (which, quite frankly are frequently the only good ones around). So, we have, LITERALLY, hundreds & hundreds & hundreds of DVD's & books about film - particularly mystery & horror. The classic horror - not the moronic slash-&-gore stuff that passes for horror these days. If it's old, &/or classic, & out on DVD, chances are more than excellent I have it - lol!! Sometimes in duplicate - lol!!
I also love good British mysteries, particularly the "Midsomer Murders" series. Well-written, well-acted, & new-age yet old-time (Agatha Christie style) country-house murders. Also the Helen Mirren "Prime Suspect" series.
What I like about them most is that you can watch them over & over (& I have all the ones currently available on DVD) & still catch something different. Very well done.