The annual memorial ceremony for Sir Richard March's long-dead first wife ended in a family scandal: an angry aristocrat threatened to disinherit his descendants. And that same night he was poisoned with strychnine, stolen from the bag of his grandson, a doctor. Which family member decided to commit the crime and how did the killer manage to leave no traces? Inspector Cockrill is determined to establish the truth...Isabelle Drew was not nicknamed Jezebel for nothing: this beauty seemed to have the only true passion in life - to do evil to others. Therefore, her murder right during the performance shocked many, but surprised few. The culprit was one of the eleven men who played the knights. But who? Their faces were hidden by visors during the performance, and they themselves were clad in identical armor from head to toe. And many, as Inspector Cockrill finds out, had their own reasons for getting rid of Isabel...