One difficulty I have in liking a lot of Queen stories has absolutely nothing to do with stylistics or characterization (the usual complaints regarding this author). My problem is that I just don’t find the concept of a dying message motivationally believably, except in very rare cases. For in truth (as history has shown), people will continue in a vain, unrealistic attempt to stay alive long after they have any real chance of surviving . They will usually expend every last breath in this hopeless effort, even if clear-headed reason would tell them they haven’t a chance. Sure, if they were really certain that they had no chance to survive, then they might move on to their second highest desire: to have their death avenged. But if there is even a glimmer of hope (or, if they can even *imagine* a glimmer of hope), they will cling to that glimmer (for, after all, if they do survive, they can probably achieve *both* of their aims).
In the Tragedy of X, Queen goes to impressive lengths to impress upon the reader the motivational believability of someone leaving a dying clue, and through these efforts does a fair job of convincing us. But in subsequent Queen works, it is just taken as a given: people who have been fatally injured will spend their last moments trying to identify their killer. It just doesn’t work for me, and it usually too central to the plot to be overlooked as a flaw.
Often derided as it is, The Da Vinci Code is one of the few books that have ever satisfactorily justified (for me) the dying clue. This is primarily because the reason for leaving the clue in that case is not to identify the killer, but rather to carry on an import secret.
This all said, I just included a dying clue (with four different interpretations) in my recent musical whodunit “Murder on the High C’s.” But my story was a farcical endeavor in a cartoon-like musical comedy world (my victims were given false directions that lead them to unwittingly jump overboard, and were electrocuted en masse in musical kicklines, etc…), and I do believe that makes an important difference.