No nothing secret -- it's just a stupid little fly on a small hook with beadchain eyes, 2 clumps of marabou and some flashy dubbing. I used to use flash strands, but they foul too much.
I do things a little differently than most people do for warmwater species -- whereas most folks like larger hooks and hence larger flies, I do not. I like small flies.
My go-to fly is basically the one below, but with no flash and instead a small amount of flashy dubbing between the 2 marabou clumps. Also, I don't like the stringy marabou in the one below -- I hand strip the crappy tips and just use the fluffy stuff which moves more. Also, the green clump below is almost too long and will probably foul -- I go shorter. Also, I like it only in a size 12 and 10 hook. I don't even care for it in a size 8 because I don't think it gives a good profile. A size 14 has too little of a hook gap and will fatigue (bend open) after a few fish.

I've caught 5 NSH (?) with it now, several large bass, some catfish, perch, maybe something else, and more sunfish than I can count. The only species I don't use it for is carp, because for carp I want a heavier fly that gets down quickly and brook trout because I really only fish dries for them (or else I'd rather go do something else....like play gin rummy with Beth).
A pocket full of these and a good hook file to keep the points sharp and I'm happy.
Gene ("big fish, little fly") TurbineBlade