Gentlemen and Players by Joanne Harris

Audere, agere, auferre.
To dare, to strive, to conquer.
For generations, privileged young men have attended St. Oswald's Grammar School for Boys, groomed for success by the likes of Roy Straitley, the eccentric Classics teacher who has been a fixture there for more than thirty years. But this year the wind of unwelcome change is blowing.

Suits, paperwork, and information technology are beginning to overshadow St. Oswald's tradition, and Straitley is finally, and reluctantly, contemplating retirement.

He is joined this term by five new faculty members, including one who -- unbeknownst to Straitley and everyone else -- holds intimate and dangerous knowledge of St. Oswald's ways and secrets. Harboring dark ties to the school's past, this young teacher has arrived with one terrible goal: to destroy St. Oswald's.