Three-Fingered Detective

A renowned private detective, acquainted with the bride's uncle, is invited to the wedding ceremony. The groom's family is affluent, owning vast tracts of land. The bride, a former teacher, was rumored to have had an affair, a factor in the family's opposition to the union. On the ceremony night, the bride and groom are murdered in a sealed room. Evidence persists in the form of a wall handprint, still showing only the trace of three fingers.