Without looking up from his phone, Mike handed back Sean’s T-shirt. "What about the dogs?" I said. "No dogs," said Mike. "We’re high-tech these days." Staring at the screen, he turned in a slow circle, then stopped. The phone chirped a couple times, then gave off a high, steady hum like the tone that comes on over the color bars on TV stations late at night. "Okay," said Mike, lowering the phone but not closing the cover. "That’ll do it. Thanks for your help." He headed for the door, and I hurried around to cut him off. "Wait a minute," I said. "You can track him with that thing?" "I’ll notify you if we have any new information," said Mike, trying to angle around me. "Just hold on," I said, staying between him and the door. "If that thing you’ve got there can follow his trail

