“Look at the roof,” Holly told him. McGrath looked. The roof was streaked with dark green paint, but he could see it was peppered with tiny holes. Like somebody had fired a shotgun right through it. “We stared at those damn holes for two whole days,” Holly said. “I’ll remember them the rest of my life.” “There are a hundred and thirteen of them,” Reacher said. “I counted. It’s a prime number.”