Between 1915 and 1917 1.5 million Armenians were killed in the 20th century's first genocide, and to this day the existing Turkish government still denies any wrong doing!
It is Franz Werfel's merit that he made the world listen to the crying of the Armenian people, which would have been almost forgotten otherwise.
He tells the story of a handful of men being deported to the Syrian desert who - by courage of despair - manage to escape to the mountain Musa Dagh (which means "mountain of Moses") and resisting the flabberghasted superior Turkish soldiers for forty days, until they were discovered and rescued by french war-ships.
When the book was published in 1933 in Germany, Werfel also intended to draw attention to the imminent same fate that the Jews were facing in Germany, but it was in vain. Both, the Nazis and the Turks were outraged, and the book was banned in both countries (in post-war Germany it was published again, of course), but through the English translation it fortunately had become a bestseller already. However: When MGM was planning to make this book a movie, they had to yield to Turkish pressure not doing so! So to this very day there has not been any movie made from this excellent book.