Sherlock Holmes was in his house reading a book. All of a sudden a ball came crashing through his window, breaking it. Holmes looked out the window just in time to see three brothers running around the corner. Their names were Paul Crimson, Mark Crimson and John Crimson. 
The next day Holmes got a note on his door that read "? Crimson. He broke your window." 
Which of the three Crimson brothers should Sherlock Holmes question about the incident?