Like many other adventurers who had drifted north to the Yukon in the wake of the gold rush. Young Gerald Fanhope was something of a mystery man - a man without a past. Although his Oxford accent bespoke of an educated background, the young Englishman was obviously a drifter. Sergeant Preston knew no more of him than any one else in Dawson City, until one day he was called into the office of the mounted police headquarters...