The booming muskets and the cracking rifles suddenly began to fall off in intensity and the camelmen and the hordes of Tuareg women and naked children who had swarmed from the tents to greet them were falling silent. Here and there a hand pointed upward. Homer, Cliff and Isobel swung their own eyes up to the sky in dreaded anticipation. The hover-lorry was camouflaged to blend in with the sands and rock outcroppings of this area, but it was possible that an aircraft might have determined that this was El Hassan's base, possibly through some act of a traitor, in which case...