"The Man Who Knew" by Edgar Wallace is a novel written in the early 20th century. The story introduces John Minute, a wealthy and somewhat paranoid capitalist, and his scientific secretary, Jasper Cole. Set against a backdrop of intrigue and potential peril, it appears to weave elements of mystery concerning the characters' relationships and a looming threat to Minute's well-kept life. The opening of the narrative presents a tense atmosphere, establishing Jasper Cole in a laboratory setting as he conducts an experiment while revealing a preoccupation with a photograph of a young girl. We also see John Minute's peculiar character traits during a dinner with Jasper, highlighting his financial worries and concern for May Nuttall, a young woman of integrity who appears to be tied up in the unfolding drama. As the scene transitions, moments of tension with the backdrop of Minute's suspicious nature and intrigue surrounding the other characters suggest that the plot may soon delve into themes of crime, deception, and perhaps even romance. (This is an automatically generated summary.)