When DS Mark Pemberton embarks on a cruise to the Arctic Circle he simply wants to experience the spectacle of the Midnight sun and the splendour of the glaciers and fjords. But then a man is found stabbed in a locked cabin and Pemberton is asked by the captain to assist in investigating the death without alarming the other passengers - with the liner at sea, the killer is still on board and there is no way of knowing whether they will strike again. Praise for Nicholas Rhea: 'Rhea's real strengths are in his sharp portraits of people' - "Northern Echo".