In the book "The Devil's Arithmetic" Hannah is a Jewish girl who is an adolescent. Her Aunt Eva is coming to dinner. Hannah is a typical American teenager. She suddenly finds herself sent back in time to Nazi occupied Germany when the Jews are being collected and sent to the concentration camps.
Hannah and her cousin Eva are collected and sent to a concentration camp. At the camp they endure horrible hardships. Eva becomes sick and in order to help her Hannah switches places with her and puts on her garb. Hannah ends up being sent to the gas chamber (shower) in Eva's place. She dies and suddenly finds herself back in America where she belongs.
Hannah goes to her Eva. She now knows the sacrifice that the girl who she is named after had made for her aunt to be able to have had the family that is gathered together.