The poisonIt was a vicious, calculated murder using the deadly toxin aconite.The victimRich and powerful, John Weston had plenty of enemies, but DS Mackinnon and the Major Investigation Team have to find out who hated him enough to subject him to such an excruciating death.The suspectsEven when the source of the poison has been tracked down to a laboratory at the University of Oxford, the deadly threat remains. The staff and students at the university all seem to have something to hide.The arrestAfter an arrest is made, his colleagues believe the case is all but closed but Mackinnon's nightmare is only just beginning.