Book excerpt: A deranged killer sends a doctor on a quest for the truth - deep into the recesses of his own mind. 'Deserves its reputation as one of the greatest mysteries of all time' PUBLISHERS WEEKLY, starred review What really happened to Inis St. Erme? What was his fatal mistake? Was it when he and his bride-to-be first set out to elope in Vermont? Or did his deadly error occur later, when they picked up a terrifying hitch-hiker, or when the three stopped at 'Dead Bridegroom's Pond' for a picnic? Dr Riddle is determined to find out, but he soon uncovers a series of bizarre coincidences that leave him questioning his sanity and his innocence. After all, he too walked those wild, deserted roads the night of the murder, stranded and struggling to get home to New York City. The more he reflects, the more his own memories become increasingly uncertain, as he veers into the irrational territory of pure terror...