Harriet Watson went to jail for being involved in several drug deals. Clara ran away, leaving Vincent, an 11-year-old boy they had raised together for three years, as a helpless orphan again. Before being sent back to an adoption agency, a kind-hearted police officer tried to take Vincent to find his adoptive mother's brother, John Watson, hoping that this man who was related to Harriet could fulfill his unfulfilled responsibilities on his sister's behalf. At this time, only half a year had passed since Sherlock Holmes fell from the building, but John, who was in poor condition, resolutely took his nephew who suddenly appeared back home. While trying to become a competent elder and assume a role similar to that of a father, John found that he still couldn't forget the man he watched jump from a tall building.