Sister's Promise

A six year old girl watches as her mother crumples to the floor. Her sister, still a toddler, clings to her arm screaming for her mommy to get up.
The murderer makes a dash for the open window, then stops. For a single instant, the light of the moon plays across his face as he surveys the two children.
Then he's gone.
Days turn to weeks. Weeks turn to months. Months turn to years.
"You're safe, now," they tell me.
"He's forgotten."
"Move on."
But I know better. He'd never forget. He knows we saw him.
There can be no witnesses...