On a bright and sunny summer's day, River, an adorably artful border collie trots purposefully out of the park and through the streets of a pretty tree-lined neighborhood. When she arrives at an old brick house, the lovable canine receives treats and affection from a beautiful stranger, Caroline. Anxious to reunite her with her owner, the young woman calls the number on River's dog tag, but when Zander arrives at Caroline's doorstep to retrieve her furry friend, she finds more than just her lost pet.