Heart Fire — James M. Matheson

After the events surrounding her sister's death, Fiona Donovan has settled into a normal life. She is back home to stay, in the place she grew up, in her childhood home. She is at peace with herself. Until a friend arrives for a surprise visit. Events begin to spiral out of Fiona's control until she finds herself drawn into another wild ride of danger, death, and soul racking terror as the fires of vengeance burn through her soul, and her heart.