Shouting, Alain jerked back, and his foot slipped on the edge of the catwalk. He fell, sliding backward, and his head hit the curved brick wall behind him. A hand shot out, scratching at his scalp, and his headlamp went flying, sailing into the darkness before landing with a sick crunch as the bulb cracked. Across the sewer tunnel, Alain heard Lotario curse and then the sound of glass breaking. Darkness enveloped the tunnel, sealing them in.