A dog lover and pilot with search experience herself, Susannah was so moved by the image that she decided to volunteer with a local canine team and soon discovered firsthand the long hours, nonexistent pay, and often heart-wrenching results they face. Once she qualified to train a dog of her own, she adopted Puzzle, a strong, bright Golden Retriever puppy who exhibited unique aptitudes as a working dog but who was less interested in the role of compliant house pet. Scent of the Missing is the story of Susannah and Puzzle's adventures as they search for the missing lost teen, an Alzheimer's patient wandering in the cold, signs of the crew amid the debris of the space shuttle Columbia disaster and unravel the mystery of the bond between humans and dogs.