A Twisted Tale

Hello, my name is Soul. I'm 19 years old and a witch. I have three best friends who are always there for me even when it's something small.
This is my tale of my life, I'll tell you why every night I wake up with sweat slicked skin and tears threatening to spill from my eyes.
I'll tell you why I am constantly in fear of the known and unknown.
I'll show you why I am distrustful of those around me.

It's just a normal Saturday, or that's what it was before my best friend came running through the door of my apothecary shop with news of one of my close friends murder. Who would do such a thing?

I go home crying over the loss of my friend; that is when I see a note on my counter.

Dear Soul,
I tried to stay away, but then they got to close to you. I know you don't understand but I did this because you are what fate has given me and I wasn't about to let them harm you.
So I fixed it. There is time now.
He's gone.
What happens when the killing continues? Will Soul find out why?