A significant number of antipsychotic medications are being surreptitiously administered 'off-label' to residents suffering from dementia in a seniors' home. A local physician comes under suspicion as hospital staff and police investigate the incidents. Maggie Keiller, principal of the local high school, and her husband, Derek Sloan, become involved when one of her students, a patient of that same physician, dies of a drug overdose while in hospital. As she probes further, Maggie and the physician are both targeted by someone unknown, who sabotages their cars to explode when the engine is started. Both narrowly escape a horrifying death, but another person is not so fortunate. As events hurtle toward a climax, Maggie and Derek face increasing danger, not knowing who the true culprit is. When the deranged killer makes a final, frenzied attempt on her life, Maggie is caught totally off guard. This riveting thriller closely examines the primary duty of every doctor:- First, do no harm.