Miles Burton 
Death in the Tunnel 

'Death in the Tunnel’ is a mystery novel written in 1936 by Cecil John Charles Street (1884–1964) under his pseudonym Miles Burton: Sir Wilfred Saxonby travels 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 …