The Tears of Isis (Talisman)

Olly Christie and Josh Welles are on an archaeological dig in Egypt, with Olly's father who is searching for the first of the Talismans of the Moon - the Tears of Isis. Olly and Josh are determined to investigate. Not only do they have to avoid the Egyptian tomb booby-traps, they will also have to thwart whoever it is who is trying to sabotage the dig...