Obelists En Route

The luxurious Transcontinental Express, a locomotive journeying coast-to-coast across the United States, is the height of 1930s technology and sophistication. Alongside carriages for dining, drinking and dancing, there's even a swimming pool car - in which the corpse of a banker is found floating facedown just one day into the journey. With nowhere to hide, any passenger could be next. It's up to the clever Dr Pons - with his sharp wit and knack for impossible puzzles - to get to the bottom of the case, before it is too late.