Harold Monkhouse is usually such an uncomplaining patient so when his brother Amos calls in one night, what he doesn't expect is to see him at death's door. Suspicions aroused, he demands an urgent second opinion. And when Harold is later found dead from arsenic poisoning, Amos is left in no doubt that foul play is afoot. The inquiry begins and Barbara Monkhouse is soon singled out as the prime suspect. What ensues is a roller coaster ride into crime...