Do You Hear What I Hear? - Paperback

Then:

During the Nazi Occupation of Poland, Dr. Joseph Mengle performed sadistic experiments on twin children. Nathan Oberst barely survived the torture of the death camp, but had to watch his twin, Noah, died before his eyes. At that moment, Nathan witnessed the antient evil behind Mengele that fed on the misery and deaths of the children. As the sole survivor, it is up to Nathan to stop it.

Now:

Jason Collins and his twin, Jimmy, go on a vacation with their parents to Sao Paulo, Brazil. Their rent house is haunted, scaring all of them out within a matter of days. In a panicked frenzy, their dad wrecks the car, killing everyone except for Jason. Now orphaned and blinded. After returning to the United States, Jason learns to adjust living with his Uncle Dan (his father's twin), Aunt Janie, and his cousin, Justin.

Jason must deal with survivor's guilt, and even more challenging is adjusting to his blindness. His remaining senses heighten so much, he feels a supernatural presence, even hearing its voice. It haunts the family.

Meanwhile, Nathan has linked Mengele to the Sao Paulo rent house where Jason and Jimmy stayed. The Rabbi has the secret to stopping the demon, but can he find the family in time?