Title: Cold as Blood - Alex Barclay - book
Summary :
Jean Transom, 35, lives alone with her cat. She has no friends, no lover, and even fewer enemies, and works for the FBI. In short, she leads a well-ordered life... until the day her body is found in the Colorado mountains. Ren Bryce, an FBI agent as gifted as she is uncontrollable, excessive, and anxious, is put in charge of the investigation. She doesn't have a single lead, but to ensure justice, she will vanquish the demons that haunt her day and night.