It's sort of a thriller-mystery-drama-fantasy. Unexplained things keeps happening. I like everything about it!
Another awesome series is Kingdom Hospital. Also by Stephen King, but this series really IS Stephen King! It's weird, strange, creepy, mental... Uhm, you get the point! :D
Also based on a novel if I remember correctly, so I think that's why it's only 1 season.
Totally worth your time, watch it. ;)