On the half-envelope lay an object apparently so peculiarly terrifying that the little postmistress caught her breath and turned quite white at sight of it. And yet it was only a square bit of paper, perfectly blank save for half a dozen thread-like lines scattered through its texture. For a long while the postmistress stood staring at the half-envelope and the bit of blank paper. Then with trembling fingers she lighted a lamp and held the little piece of paper over the chimney--carefully. When the paper was warm she raised it up to the light and read the scrawl that the sympathetic ink revealed: "I send you a sample of the latest style fibre. Look out for the new postmaster at Nauvoo. He's a secret-service spy, and he's been sent to see what you are doing. This is the last letter I dare send you by mail." There was no signature to the message, but a signature was not necessary to tell the postmistress who had written the letter. With set lips and tearless eyes she watched the writing fade slowly on the paper; and when again the paper was blank she sank down by the window, laying her head in her arms. A few moments later Helm came in wrapped in a shining wet mackintosh. He glanced at his box, saw it was empty, wheeled squarely on his heels, and walked out. Towards sunset the rain dissolved to mist; a trail of vapor which marked the course of an unseen brook floated high among the hemlocks. There was no wind; the feathery tips of the pines, powdered with rain-spray, rose motionless in the still air. Suddenly the sun's red search-light played through the forest; long, warm rays fell across wet moss, rain-drenched ferns dripped, the swamp steamed. In the east the thunder still boomed, and faint lightning flashed under the smother of sombre clouds; but the storm had rolled off among the mountains, and already a white-throated sparrow was calling from the edge of the clearing. It promised to be a calm evening in Nauvoo. Meanwhile, Helm walked on down the muddy road, avoiding the puddles which the sun turned into pools of liquid flame. He heard the catbirds mewing in the alders; he heard the evening carol of the robin--that sweet, sleepy, thrushlike warble which always promises a melody that never follows; he picked a spray of rain-drenched hemlock as he passed, crushing it in his firm, pale fingers to inhale the fragrance. Now in the glowing evening the bull-bats were soaring and tumbling, and the tree-frogs trilled from the darkling pastures. Around the bend in the road his house stood all alone, a small, single-storied cottage in a tangled garden. He passed in at his gate, but instead of unlocking the front door he began to examine the house as though he had never before seen it; he scrutinized every window, he made a cautious, silent tour of the building, returning to stare again at the front door.