They flew in a shifting V, dark and purposeful against the butter yellow sky where the sun was setting. Along the lakeshore, the poplar and birch were already leafed out. It had been a mild winter; actually, it had not been much of a winter at all. There’d been hardly any snow, the lakes had frozen late, and the ice had gone out early. The resorts, usually buzzing with the activity of snowmobilers and ice fishermen, were empty. April, which folks in the North Country called “mud season,” had been dry as well. There was common agreement that the seasons weren’t what they used to be. Global warming, everyone said, and shook their heads helplessly.Cork should have spent the day getting Sam’s Place ready for the summer. Sam’s Place was an old Quonset hut on the shore of Iron Lake just outside the official limits of Aurora. Long ago, an Ojibwe named Sam Winter Moon had converted it to a burger and shake joint that had become popular with both locals and summer visitors. When Winter Moon died, he’d passed the place to Cork, who’d been like a son.