A guilty secret. A gruesome murder. A DEADLY MOTIVE. Deadly Motive is the second book in the Detective Jack Mackinnon crime series. A man is found poisoned by the deadly toxin aconite. A note found at the scene leads Detective Sergeant Jack Mackinnon to a University of Oxford laboratory, where staff and students are desperate to hide their association with the victim.After an arrest is made, his colleagues believe the case is all but closed...