# XXI: An Explanation explained — The Murders in Praed Street > Chapter companion for The Murders in Praed Street by John Rhode. ## What happens The Black Sailor, having captured Dr. Priestley, recounts his elaborate scheme to execute the vengeance of Dr. Morlandson upon the surviving jurymen. He explains how he established himself as a herbalist in Praed Street, used Mr. Copperdock as a dupe, and devised distinctive methods for each murder, including the use of poisoned lamps, disguises, and alibis. He details the murders of Tovey, Pargent, Goodwin, and Martin, emphasizing his psychological manipulation of Inspector Whyland and his careful planning to avoid detection. ## Themes in this chapter ### Deception and Disguise The Black Sailor uses multiple disguises (Mr. Ludgrove, a man with a port-wine mark) and false identities to commit murders and evade suspicion. ### The Psychology of Fear The Black Sailor manipulates Inspector Whyland's mind and exploits the fear of the numbered counters to cause Goodwin's fatal shock. ### Justice and Vengeance The Black Sailor frames his murders as acts of justice, executing Dr. Morlandson's vengeance on the jurymen who condemned him. ## Character check-ins ### Dr. Priestley Captive audience to the Black Sailor's confession; listens intently, hoping to devise a plan for capture. ### The Black Sailor The antagonist who reveals his identity and methods, explaining his role as the executor of Dr. Morlandson's vengeance. ### Mr. Samuel Copperdock Described as a simple and not over-intelligent dupe upon whom suspicion was cast; his bone counters and envelopes were used in the murders. ### Mr. Jacob Martin Victim lured to Praed Street via a blackmail letter; killed by a poison device in a cellar. ### Mr. Richard Pargent Victim killed on a traffic refuge in Praed Street using a disguised method similar to Tovey's. ### Inspector Whyland Manipulated by the Black Sailor, who became his confidant and influenced suspicion toward Copperdock. ## Key lines > I was thus able to become on confidential terms with Whyland, and, by making a friend of him, to put myself above suspicion. And all the time I was influencing his mind in the direction of Mr. Copperdock. The Black Sailor befriended Inspector Whyland to avoid suspicion while subtly steering the investigation toward Copperdock. _Illustrates the theme of deception and psychological manipulation._ > I was to execute the vengeance of Dr. Morlandson upon the men who had condemned him to so many years of agony. But this must be done in such a manner that their deaths would not be attributed to pure chance, but must eventually be made to appear as acts of justice, as indeed they were. The Black Sailor saw his murders as a form of retribution, ensuring each death carried a clear mark of deliberate justice. _Highlights the theme of justice and vengeance._ > I have always considered that the execution of Goodwin was not up to my usual standard. The Black Sailor felt that killing Goodwin by sending a counter was less ingenious than his other methods. _Reveals the killer's vanity and artistic pride in his craft._ ## Links - HTML: https://www.betterreads.online/discover/the_murders_in_praed_street_se/chapters/xxi-an-explanation - Book: https://www.betterreads.online/discover/the_murders_in_praed_street_se - All chapters: https://www.betterreads.online/discover/the_murders_in_praed_street_se/chapters