Final answer:
Sherlock Holmes should question Mark Crimson about the broken window, as the note implies with its wording, '? Crimson. He broke your window.'
Step-by-step explanation:
The puzzle presented is a classic example of a lateral thinking riddle, where attention to detail in the wording of the note is crucial. The note reads, “? Crimson. He broke your window.” If we take the question mark to signify a mystery man, what we’re left with is the phrase, “____ Crimson. He broke your window.” If we look at the names of the brothers, only one of them fits naturally into the sentence and makes sense. “Mark Crimson. He broke your window.” Hence, Sherlock Holmes should question Mark Crimson about the incident because the note likely intended to communicate the name 'Mark' as a verb indicating the culprit.