'And Benny was in that same tunnel, too,' I said. 'He either got the knapsack from the murder scene or from someone, or it was dropped on his blankets as he claims.'

'Frankly, I don't think it just turned up on his blankets,' Maier said.

'Why?' Commander Penn asked him.

'Why would Gault want to carry it from Cherry Hill? Why not just leave it and be on his way?' he said.

'Maybe there was something in it,' I said.

'Like what?' Marino asked.

'Like anything that might identify her,' I said. 'Maybe he didn't want her identified and needed a chance to go through her effects.'

'That could be,' Commander Penn said. 'Certainly we have found nothing among her belongings that would seem to identify her.'

'But in the past Gault hasn't seemed to care whether we identified his victims,' I said. 'Why care now? Why would he care about this head-injured, homeless woman?'

Commander Penn did not seem to hear me, and no one else answered. The medical examiners had begun undressing Davila, who did not want their help. He held his arms rigidly folded across his torso, as if blocking blows in football. The doctors were having a terrible time getting the commando sweater free of limbs and over his head when a pager went off. We involuntarily touched our waistbands, then stared toward Davila's table as the beeping continued.

'It's not mine,' one of the doctors said.

'Damn,' the other doctor said. 'It's his.'

A chill swept through me as he removed a pager from Davila's belt. Everyone was silent. We could not take our eyes off table five or Commander Penn, who walked there because this was her murdered officer and someone had just tried to call him. The doctor handed her the pager and she held it up to read the display. Her face colored. I could see her swallow.

'It's a code,' she said.

Neither she nor the doctor had thought not to touch the pager. They did not know it might matter.

'A code?' Maier looked mystified.

'A police code.' Her voice was tight with fury. 'Ten-dash-seven.'

Ten-dash-seven meant End of tour.

'Fuck,' Maier said.

Marino took an involuntary step, as if he were about to engage in a foot pursuit. But there was no one to chase that he could see.

'Gault,' he said, incredulous. He raised his voice. 'The son of a bitch must've got his pager number after he blew his brains all over the subway. You understand what that means?' He glared at us. 'It means he's watching us! He knows we're here doing this.'

Maier looked around.

'We don't know who sent the message,' said the doctor, who was completely disconcerted.

But I knew. I had no doubt.

'Even if Gault did it, he didn't have to see what was going on this morning to know what's going on,' Maier said. 'He would know the body was here, that we would be here.'

Gault would know that I would be here, I thought. He wouldn't have necessarily known the others would.

'He's somewhere where he just used a phone.' Marino glanced wildly around. He could not stand still.

Commander Penn ordered Maier, 'Put it on the air, an all-units broadcast. Send a teletype, too.'

Maier pulled his gloves off and angrily slammed them into a trash can as he ran from the room.

'Put the pager in an evidence bag. It needs to be processed for prints,' I said. 'I know we've touched it, but we can still try. That's why his coat was unzipped.