Vampire on the Orient Express by Shane Carrow

Paris, 1914. American adventurer Sam Carter boards the Orient Express, departing France in style after an impulsive decision to desert the Foreign Legion. British diplomat Lucas Avery is already nursing a drink in the smoking car, resenting his assignment to the distant Ottoman Empire. Neither man expects anything more from the next three days and three thousand miles than rich food, expensive champagne and fine cigars.

But something dangerous is lurking aboard the train, hiding in plain sight among French aristocrats and German businessmen. Through fire and darkness, through blood and ice, the Orient Express is bearing an ancient evil across the continent – and not all its passengers will live to see Constantinople…