In 1888, a killer roams the East End London streets strangling, stabbing, slashing and mutilating his victims. Despite the best efforts of D.I. Edmund Reid and D.C. Walter Dew, the elusive criminal remains at large. After 12 years hunting a ghost, Dew calls upon Captain Arthur Hughes to track down the psychopath, but with one condition; to keep his incredulous subordinate out of the case. Despite the order, Hughes enlists the absurd, womanising drunkard Lieutenant Davis, though with one further dilemma; in one week, the unruly duo will be sent to the front lines of the developing war in southern Africa. With limited time and resources, they must rely on Davis' unusual and imaginative methods of recreating the crime scenes to SOLVE THE UNSOLVABLE MURDERS.