Tora has been told that the Shetlands a Tora Hamilton is an obstetric surgeon who has recently moved to the Shetland Islands with her husband, Duncan. Tora has been told that the Shetlands are 'one of the safest places to live in the UK', so the last thing she expects is to find a dead body in a peat bog in the field beside her new home. To make things even more shocking the body has had the heart removed and is carved with symbols which match the ancient runes on the wall in Tora's cellar. As Tora becomes more and more determined to find out what's going on she discovers that someone else is equally determined to put an end to her investigations.