Dorothy Martin and her husband, retired Chief Constable Alan Nesbitt, go on a trip to Orkney in Scotland to visit an old friend and see some intriguing Stone Age excavations. They realize there's considerable dissension between the archaeologists and the principal donor for the newest dig, a wealthy and abrasive American. When a more recent corpse is found at the dig, various suspects are named, but there's not enough evidence to bring a case...