The Man Who Knew is a classic one by Edgar Wallace, so I was excited to read it. Unfortunately I was a bit disappointed. I liked the idea of the Character of the "Man who knows" but he could have been a little more mysterious. Plus it turned out, he actually didn't know that much. Also I was a bit confused at the beginning about the characters, but that's not unlikely for me when I read a Edgar Wallace story. What I liked was the plot twist, I hadn't expected that conclusion. But the ending then was a bit abrupt and unlovingly. So, I read better things from Mr Wallace. But in the end it was a nice read for a sunday on the couch