Hi! :) Yep, Sherlock Holmes here too... and yeah, I know the Basil Rathbone ones are not like the real stories, but it was my introduction and what I grew up on because of Mom. LOL The other show - Remington Steele. Boy did I love watching that (well, the reruns, never knew it about it when it was on the first time around. Too young.)
Lit-wise, I was introduced to a few different ones in the Detective fiction class I took some years back, but from there, still liked Sherlock, but that's where I first read Robert Parker/Spenser. :)
Well, the best that I can say that I do, is I basically have a general idea as to what's going to come next, but it of course could change at a whim. LOL The only thing I really know is I always try to alternate between a historical and contemporary, to try to not get too tired of one or the other. But regardless on how big the TBR pile is, I always do plenty of rereading. . . if I'm in the mood for an old favorite, then I'm going to read it. I also do plenty of rereading when I can't add to that TBR pile, much like now. LOL :)