I have been told by a number of sources that one of the worst ways you can open a book is showing raw emotion without inducing that emotion in the reader, which is to say, explaining to the reader why the character is feeling that way. Are there exceptions to this rule? What about prologues? I am in a situation where the foundation of my novel is based on the reaction to a tragic loss, but I feel that to go into the complications of the matter would greatly defect the emphasis from the plot, which takes place a number of years later. Is there some way I can show this without immediately boring the reader?