The Post Office

I've been writing the beginning to "The Post Office." I'm taking a different turn with it...what do you think of this idea? It's a little darker. But, Eph, the man who sorts the mail is sort of mentally unstable. He's thought to be the slow one in town, the child in a man's body. One day Eph reads a letter from Sophie to Jaime (by accident) and becomes enthralled. He begins to follow the correspondence of the lovers, and in turn falls in love with Sophie too. But he's never met Sophie, so his love is more of an obsession with this ideal women, someone he's created in his head with the help of all the letters to "know" who she is. His obsession with her drives him mad, and he decides the only thing to do is kill Jaime, so he can have Sophie for his own. What Eph doesn't realize is that by killing Jaime, Sophie won't write any more letters, and so he's killed her too, because to him Sophie lives only through the letters she writes to Jaime. The grief and guilt he feels over killing his beautiful Sophie is so great that...

And I haven't figured out the ending yet. What do you think?