Tess Mitchell’s blue eyes flashed at the precinct commander as he entered the interrogation room where she had been placed in isolation. She had seen his face before on local TV in Tucson. “My name is Lincoln Lewis and I’m in charge of this precinct,” he said, with a sneer. His overall manner, however, was entirely professional. “I know you’ve spoken with some of our agents already, but it would be a real help if you could clear up a couple of things from your statement.” “Of course.” “For one thing, I need you to tell me what, exactly, you were doing at four o’clock this afternoon in Professor Jack Bennewitz’s office.” “You mean when I discovered . . . the body?” The police nodded. Tess swallowed hard. “Well, we had been working together on a project connected to his field of investigation. I was doing research for him and this morning I came across some data that I thought would interest him. Observational data. Technical things.” “I see. And what was it that Professor Bennewitz taught?”