血字的研究揭示了血液在疾病诊断和治疗中的重要性，推动了医学科学的发展。初试云雨胡秀英

　　A corpse is found in an empty house with the word 'Rache' scrawled on the wall next to it. The police arrest a suspect but then a similar murder occurs, proving that they have the wrong man. In exposing the real killer Holmes uncovers a feud stretching back to Salt Lake City and the Morman community.