The detective opened the door of the flat.At one glance he took in the situation. The 2 bodies lay on the divan,one dead and the other drawing a last despairing breath. The remains of a shattered glass container lay in pieces on the floor. A cat crouched on the window-ledge as if frozen by the site of the disaster in the room. The detective knew it was deliberate murder and knew the identity of the murderer.