"Halloween 1861. A special train with two carriages steams across the Lake District at night on its way to a place notorious for its record of supernatural incidents. Most of those on board have been fortified by alcohol so the mood is boisterous. Lighting inside the carriages is poor and without warning, the lamp goes out in the last compartment of the second carriage, plunging it into darkness. When the special reaches the end of its journey, the...

"On a dark November evening, Sir Wilfred Saxonby is travelling alone in the 5 o'clock train from Cannon Street, in a locked compartment. The train slows and stops inside a tunnel; and by the time it emerges again minutes later, Sir Wilfred has been shot dead, his heart pierced by a single bullet. Suicide seems to be the answer, even though no reason can be found. Inspector Arnold of Scotland Yard thinks again when he learns that a mysterious red light...

"1862. A goods train is going through the Sapperton Tunnel when it hits a makeshift pen of sheep inexplicably set up near the exit. The animals are slaughtered by the impact whilst the train hits a pile of rocks and is derailed, seriously injuring the occupants. Inspector Colbeck is called in to investigate and discovers that the shepherd and his dog are missing. Stephen Ryle who owned the sheep is shocked by the occurrence which further affects him...

While traveling from London to Kingfisher Hill to discretely investigate murder allegations against a wealthy client's wife, Hercule Poirot swaps seats with a nervous train passenger before a second killing is complicated by a series of impossible confessions.