A Christmas journey by train... A mysterious lady in red... A vanishing woman... Tad Fowler has recently sold his programming business and plans to spend the holiday with family. Now supplied with ample money and leisure for a slow trip by train from Los Angeles to New York, he hopes to spend the trip daydreaming and reading mystery novels - and reconsidering his solitary, work-obsessed life. A chance meeting aboard the train derails Tad's hope for a quiet, reflective journey. The woman he meets, Quinn Shepherd, immediately captures his imagination. He discovers that Quinn is the traveling companion of her wealthy friend, Aubrey Borden-who has confined herself reclusively to her cabin. When Aubrey vanishes, Quinn comes to Tad for help. Together they face a real-life mystery: how can a woman vanish from a moving train?