shaking her head , she swiped at the still-falling tears with the back of her hand . a spot of chocolate marked todds chin . about the case , if you must . '' a low steady siren starts to sound as green spinning alert lights appear on the great walls . i grin back at them , pick up my book . `` guard , come down here at once ! '' but it disappeared the instant he saw it . although now im thinking it might come to that if tam gets any worse . 