"She saw everything! Of course I'm frustrated!" "Sherlock-" "The killer made a fatal mistake, John-" 'Sherlock-" "He let her see everything, and now she won't tell-" "Sherlock!" He wheeled around to me, baring his teeth. "What?" he hissed, his voice dripping with venom. I gazed back at him helplessly. "She's mute, Sherlock." I felt my heart pump a little slower. "She...she can't tell."