Millie Nyall is about to her unveil her most exciting new museum exhibit: the gold mask of the famous pharaoh Ramses the Second (he lived to be 96 and had 200 wives). But all she reveals is extraordinarily shrill lungs as she screams: the mask is missing! Eleven-year-old detectives Zac and Hannah lead the reader through the clues and help them piece together all the forensic science methods used, such as DNA fingerprint plotting; explosive residue analysis; following footprints (even toe prints) to calculate the weight, height and gender of a suspect; acoustic analysis of a rock song; forensic odontology (the examination of evidence left by teeth); using ultraviolet and infrared radiation to read burnt documents; and QEMSCAN - a scanning electron microscope that is used to analyse ancient treasures.