Before Emma could say anything, the cat streamed past his legs into the dark hallway beyond. Dr. Banerjee watched it go with an abstracted frown. “Agassi?” Then he glanced up at Emma. For a moment he looked blank, as if he did not quite remember who she was. He blinked at her.

“Sutton,” he said at last. “Hello. Did you bring Agassi home?”

“Um, I actually wanted to ask you something. About Nisha.”

His eyes seemed to focus sharply, his look of mild confusion evaporating at once. “What is it? Do you know what happened to her?”

Emma bit her lip. “I’m sorry, Dr. Banerjee. I don’t understand it either.” She shifted her weight. “But I was wondering if I could . . . go in Nisha’s room? I won’t mess anything up. I just want to say good-bye.”

Dr. Banerjee took off his glasses and polished them on the corner of his grimy shirt. When he put them back on, they looked more smeared than before. A sad smile quirked his lips upward ever so slightly. He reached out and patted her elbow. “Of course, Sutton.”

Somewhere in the depths of the house, the cat let out a loud, pleading cry. Dr. Banerjee gave a start. “I suppose I should feed him,” he said vaguely. His vision went a little distant again, as if the effort required to focus his attention had finally exhausted itself. He ran his fingers through his hair and left it wilder than ever. “Just let yourself out when you’re done,” he said, then disappeared down the hall.

The house was almost completely dark. A flower-shaped night-light in the hallway to Nisha’s room gave off just enough illumination for Emma to navigate. Passing the gleaming bronze kitchen, she saw the remains of a week’s worth of takeout piled on the counters. Pizza boxes and Chinese containers towered precariously. A fly circled a half-eaten samosa on a ceramic plate. A fallen pint of Ben & Jerry’s sat in a puddle of melted Cherry Garcia.

Emma had been in Nisha’s room once before, during her second week in Tucson. At the time Nisha had still been a suspect, and she’d snuck in during a tennis dinner to try to find clues. When she snapped on the light now she was surprised at how little it had changed since then. There was no sign of the mess Nisha’s killer had made—it looked like Dr. Banerjee had put everything straight. The purple bedspread was smooth, eight fluffy pillows propped at the head like an ad for a five-star hotel. All of her books were alphabetized on the shelves. The only evidence that someone had recently disturbed the room was a drawer with a broken front panel in the dresser. Otherwise it looked like Nisha could have just stepped outside.