Crebbin, June. <br/><br/>
Lucy and the firestone / 
by June Crebben. 
 - London :  Walker Books,  2004. 
 - 47 p. :  ill., col ;  18 cm. 
<br/><br/> The firestone in the Royal Lighthouse has gone out!  Lucy, the Lighthouse Keeper's daughter, must follow the clues in the riddle to find another one before it's too late. 
<br/><br/><label>ISBN: </label>0744565960