Simon Raven 
In The Image Of God 

The sixth in the ‘First Born of Egypt’ series sees Raisley Conyngham, Classics teacher at Lancaster College exert a powerful influence over Marius Stern. His young pupil however is no defenceless victim. Marius has a ruthless streak and an ability to sidestep tests and traps that are laid for him. Which is just as well because everybody is after something from him.