'He heard and felt something behind him that chilled and stopped him. It was a growl-the last sound he would have expected in the tight, dark space. His foot had touched something, solid but not hard. His mind flashed with images of wild animals cornered in dark spaces-rabid raccoons, possums, badgers? But these were animals from his mother's stories of Virginia, not of the city, not of Boston. Sam wanted to turn and look but held still. He decided...