a capsule novel?...

In their lives the two sisters were not unlike the two fish they had as children. The two fish lived in the one tank. One fish, the one that was Kaitlin's, was always eating. She even tried to eat the plastic weed. The other, the one that belonged to Sylvia, was always staring at her own reflection in the glass. In the side of the tank. She appeared to be staring out but was always, in fact, staring in at herself. One morning, Kaitlin's fish ate Sylvia's. For the next week, Kaitlin ate nothing. Then one morning she sank to the bottom front right corner of the tank, and ebbed there until the next morning when she floated up, dead.