Shade and shadow - Francine Woodbury

TAKING A BYTE OUT OF CRIME
Raoul Smythe wanted nothing more than to be left alone with his computer research. Unfortunately, such uninterrupted study wasn't an option for a mere assistant professor of modern magic at Oxford, especially the black sheep of the department. And when his department head turned up dead, Raoul found that he was the prime suspect in a murder case.
Raoul had to clear himself or risk having his magic permanently and completely stripped away. His course was clear: he must find the real murderer. Armed only with his magical talents and his wits, he would have to untangle a web of office politics, concealed hatreds, jealousies, and betrayals . . .
And time was running out.