The subject is quite well described in other reviews. A young professor discovers a photo in the Buchenwald camp during a school trip and thought he recognized his father in the guise of a prisoner while standing behind the camp doctor. Obsessed by this resemblance, this young teacher will conduct its investigation in both archives and history books that within his own family. In this way, the truth, finally, that a little different from each protagonist will be updated.
What is fascinating in this book is precisely that there is no truth LA but each character, with its strengths and weaknesses, will better understand the sequence of events. Interestingly, this young teacher in search of identity never reveal his own: it is a Fabre-Wagner, but his name is never specified (unless it has escaped me).
Grandfather "originator" deportee who died in the camp has not always been the poor victim. He has a past that does not mean that it was an angel. The other grandfather, the real Fabre, which appears gruff airs, has not so far denigrated the bastard son and raised his best considering it as his own son. As for the Germans, they are not presented in a uniform manner. There the executioners but there are also those in the Nazi system while participating in resistance from within. Here again, the truth is multifaceted.
Finally, meet a toddler son deported to Nazi with a small daughter is interesting because it shows how painful past is still present in the memories and still determine human relations.
In short, in a book not very thick in pages, the author discusses many subjects with great insight, subtlety and modesty that it is impossible to stay indifferent.