Chapter Eight The broad surface of Nimbo Lake looked still and tranquil as the helicopter approached it. But looks can fool you, Riley reminded herself. She knew well that calm surfaces could guard dark secrets. The helicopter descended, then wobbled as it hovered in search of a place to land. Riley felt a little queasy from the unsteady movement. She didn’t much like helicopters. She looked at Bill, who was sitting next to her. She thought he looked equally uneasy. But when she glanced over at Agent Holbrook, his face seemed blank to her. He had barely said a word during the half-hour flight from Phoenix. Riley didn’t yet know what to make of him. She was used to reading people easily—sometimes too easily for her own comfort. But Holbrook still struck her as an enigma. The helicopter