Hercule Poirot searches for the fatal flaw in the death of a philandering artist whose wife was unfairly jailed for his murder – 16 years ago. Delving into the past, the shrewd Belgian detective wonders: Was Caroline Crale a murderer? Did her husband commit suicide? Or did someone else kill the man in what seems to have been the perfect crime... after all these years? 23rd in the series. "Uncanny... brilliant."—Times Literary Supplement