I Lived On The Streets (TMNT fanfic)

Please read "Teenage Mutant Ninja Turtles: Hard Shell, Soft Heart" first. this is the second book.

Karah was a young girl of fourteen when her grandma died. She ran out into the streets of New York, not knowing any one there. She spent three years of her life on the streets. That is, until she heard the argument behind the abandoned building. Where she saw... them.