Mischling by Affinity Konar

A set of twins arrive at Auschwitz and are taken to what is referred to as "The Zoo". It is there that Pearl and Stasha meet the zookeeper, the evil Dr. Mengele and all the other multiples who inhabit the zoo. Endless tests, painful injections, endless procedures later as they are studied and manipulated as they survive for the sweet promise that their family is being taken care of and for each other. The first rule you learn is that if your other half doesn't make it then you won't either because Dr. Mengele only is interested in you if you are a twin. This is not an easy story - it is full of evil and survival under brutal conditions in a world where you have nothing but your body and mind and still they take that away too. It is innocence lost and childhoods that have been stolen but there is still love and bits of tenderness and heroes. Powerful and moving - this is a story that needs telling.