Donald MacKenzie 
The Sixth Deadly Sin [EPUB ebook] 

When Martin Mallory falls in love with a beautiful student, he has no idea the trouble it will cause. Suddenly Li Cho disappears from the secretive Wycherly Foundation for Religious Studies. The principal, Ludovic Lambert, says she has been transferred, but won’t say where. In desperation, Mallory arranges for an ex-con friend to break into Lambert’s safe where he has heard the transfer list is kept. But the piece of paper they find is far more sinister than a simple list of student transfers.