Some of you will be familiar with this puzzle, but if you haven't seen it before have a go at working out the solution. If you want you can PM me your answer and I'll tell you if you are correct.

One snowy night, Sherlock Holmes was in his flat sitting by the fire. All of a sudden a snowball came crashing through the window smashing it to pieces.

Holmes got up and looked out of the window, just in time to see three local kids, who were brothers, run around a corner and disappear. Their names were: John Crimson, Mark Crimson and Paul Crimson.

The next day Holmes got a note through his door that read: '? Crimson. He broke your window.'

Which of the three Crimson brothers should Sherlock question about the incident?