Renni, Mahu and Balaal are enjoying the summer after thwarting the evil vizier, Paser, and returning the heart scarab to General Tatia. When new adventures call, the children set off up the flooded Nile to the mystical city of Shedet to see its glorious temples dedicated to Sobek, the crocodile-headed god. But things are not as they appear, and the wicked never rest for long...