Run Little Angel (Bioshock Fanfic)

Young Isabella finds herself abducted and taken away from her parents at a young age. She witnesses the horror and torment of being turned into a little sister, small little girls who have been put under surgery to have an adam slug implanted into their bodies.
Isabella then continues life underwater in the fallen city of Rapture, guarded by huge, fierce beasts known as the big daddy, and small Isabella, under the impression that she is in a city of freedom and beauty, walks through the bloodied walls of Rapture, totally unaware of the pain and suffering surrounding her.
It's a sudden vision that perks Isabella's curiosity, and she realizes maybe Rapture wasn't the haven she had thought it to be after all.