When Sadie Speers's granddaughter, Sara, goes horseback riding by herself, Daisy returns to the stable missing a shoe and Sara! Sadie and her daughter, Alice, along with Edwin, Sheriff Mac Slattery and friends from the community of Silver Peak spring into action to find the girl. Sadie uses her sleepless hours to delve into the story behind an old doctor's bag and medical implements that she purchased at an auction. She traces the objects back to an enigmatic figure in local history known as the Angel of Silver Peak. But how can Sadie focus on finding this woman's true identity when Sara is missing? in an effort to find her, Sadie must do her most intensive sleuthing yet. But can she move quickly enough to assure her beloved granddaughter doesn't get hurt in the cold, dark mountain forest?