A young woman begs Sherlock Holmes to help find her missing fianc , but the great detective makes an uncharacteristic mistake. Then Sherlock's daughter, Lucy James, takes on a missing person case of her own. But Lucy must also keep a vicious criminal away from Becky, Lucy's ten-year-old sister-in-law, and little Becky soon becomes dangerously involved in both cases. No one foresees the devastating...