A mysterious letter from an old friend asks Hal and Uncle Nat to help investigate a spooky supernatural mystery. Legend has it the Kratzensteins, a family of rich and powerful railway tycoons, are cursed, but there is no such thing as a curse, is there...? Hal and Nat take the night train to Berlin and go undercover. 8+ Embark on a thrilling fourth adventure in the bestselling, prize-winning Adventures on Trains series.