Celeste and Shadow

Chapter 1

 I lay in bed, staring at the ceiling. At times like this, stuck between sleeping and awake, I would usually think up ideas for books and such. Right now, though, I am out of thoughts, so I decide to think about my reality.
I wonder if my "soulmate" is actually out there. You see, all of us are born with a song. It plays in our heads until we find the only other person who has the same song. Everyone I know has found this person for them, and are happy. I haven't, though, and I sit at home and write books, while the familiar melody repeats itself in my brain.
I have the song memorized, now, but every time I attempt to copy it on piano or sheet music, the melody evades me. I have decided to stop trying. The song is all I have. All I can wonder is whether or not the writer's block will leave me- whether or not my soulmate will find me. I turn towards my clock. 1:10. I grab my phone and earbuds, turning to the playlist of my favorite songs.
Eventually, after a long search, I find sleep. Dreams are a curious thing- bundles of thoughts and memories patchworked together to create one story- one more extraordinary than any reality could inspire. I dream that I find him- the one I have been waiting for all this time.
The next day, I get up and make toast. I sit down at the computer and stare at the empty page. I write a sentence and delete it. I wrote another sentence and deleted it again. By the end of my thirteen hour workday, I had written one paragraph. Ashamed, I stay up an extra two hours until it is ten at night. At this point, I walk upstairs to go to bed, feeling defeated.
A creak comes from the door downstairs, and I stop dead in my tracks, a cold feeling of dread rushing through my veins. I never have visitors, definitely not at ten in the evening. I rush quietly to my room, and go to close myself in the closet, but the door is stuck. Underneath my bed is too crowded for me to fit under, and I can't think clearly under pressure.
I crouch down in the shadowy corner, thinking rapid thoughts. Maybe it's a robber? Maybe they won't see me? I should have brought my phone upstairs with me. I hear a quiet, deep voice, so quiet, in fact, I could not have heard it if I hadn't been listening for it.
"I've arrived at the house of the target."
Target? I wonder to myself. My breath catches in my throat as cautious, silent footsteps sound from down the hallway. The man is close. I now know they are a man from the voice they had used.
Then, I hear something, a quiet melody. At first, I think it is my head replaying it yet again, then I realize- the man is humming it under his breath- the same notes I have heard over and over ever since I could remember.
This man is my soulmate, I realize with a jolt. The melody is growing in volume, then stops as I see the shadow of a man holding a gun in my doorway. He takes a step towards me, and his face is visible. His expression is hardened, and I could tell that he saw me. He steps closer and presses the barrel into the side of my head. Suddenly, I begin to sing.
I sing the melody that I have known since birth, taking care not to leave out, nor mess up any notes. My life now depends on this song, and I pour my heart out into every second. The man's eyes widen, and his hand relaxes on the gun. Eventually, he lowers it entirely.
"Celeste Biondolillo," He murmurs. "I believe you may be my soulmate."