Nora Gavin and Cormac Maguire series

"American pathologist Nora Gavin fled to Ireland three years ago, hoping that distance from home would bring her peace. Though she threw herself into the study of bog bodies and the mysteries of their circumstances, she was ultimately led back to the one mystery she was unable to solve, the murder of her sister, Tríona... Determined to put her sister's case to rest and anxious about her eleven-year-old niece, Elizabeth, Nora returns to Saint Paul,...