The scream came from the left bank. It was a woman's scream. It went up high and long, ragged at the top, the sound of someone who has just seen something she can't stand to see, and it broke off. He held still. The tube turned slowly on the current until he was facing the bank. The phone light didn't reach it. There was only the black wall of the trees. The scream came again, closer to the water. "Hello?" he said. Then, louder, "Ma'am? You okay...