Tell people you're reading a Christie novel set on a train--a Poirot, no less--and they'll almost definitely think you're reading Murder on The Orient Express. And you might be! But you might also be reading The Mystery of the Blue Train, which predates its much more famous sibling by a few years.... Climb aboard with us and traverse not just the French countryside but a hybrid whodunit/thriller centered on murder, adultery, priceless jewels, and a 33-year-old woman who is apparently in the "autumn" of her life (!!). This one definitely was not Christie's favorite, but we found a lot to enjoy here.