Shout-Out: A Man Lies Dreaming by Lavie Tidhar

Deep in the heart of history's most infamous concentration camp, a man lies dreaming. His name is Shomer, and before the war he was a pulp fiction author. Now, to escape the brutal reality of life in Auschwitz, Shomer spends his nights imagining another world - a world where a disgraced former dictator now known only as Wolf ekes out a miserable existence as a low-rent PI in London's grimiest streets.