Netflix suggested that I would enjoy The Lost Room, a six-(TV)-hour show that ran on the Sci-Fi channel a few years ago. Boy were they right!
I can't say too much about the plot without spoiling the show, which does a very good job of revealing new information at the right time and in an interesting manner. The show revolves around Detective Joe Miller, who, while investigating a robbery and suspicious deaths, comes into possession of a key to a "non-existent" hotel room. Use the key to open any lock, get transported to the lost room. Exit the room to any door you choose. Powerful, fantastical, and you can imagine the possibilities if such a key existed.
Except that Joe's eight-year-old daughter disappears into the room and vanishes. Joe's quest is to get her back. As he tries to do this he learns that there are other special objects -- and other people interested in obtaining them.
The story is well-written (though the ending felt rushed). I particularly noticed the dialogue drawing me in. The story is on the dark side -- this is not your pixie-dust-and-bright-lights magic -- but has a fair bit of levity in good places (and my favorite line in the entire show made me laugh out loud). I don't usually notice acting (though often notice its absence :-) ) but I did notice it here; Joe and the primary sometimes-friend, sometimes-antagonist were well-done and the others weren't bad. The visual style was appropriate and the room was well-done. The music did a good job of setting the mood.
I found the show very satisfying. If you like "thinky" plot-driven SF, I think you might too.