Hello Hamen!
I have to say (as I keep saying when I'm reviewing this story) that this chapter was realy really good! Loads of mystery, it felt like "season finale".I was thrilled from beginning to end! Derek's evolution as a character is really well written, and it seems to have reached a new level in this chapter.
In my poor attempts to write (lol), I always find so hard to show those changes in characters along the story, as they get more mature and all, and you did it perfectly!
I'm looking forward to part 4! Congratulations for the good job!