It's a term I made up to describe a twist in fiction that can make the "black moment" more shocking to a reader. The black moment is a part of the basic structure of fiction that has been knocking around for centuries.
- The inciting incident.
- The mounting tension.
- The black moment.
There are as many variations on this structure as there are writers who write about writing, but roughly this is the basic formula for your plot in fiction. Everything else is a refinement on this.
The black moment is the part of the story just before everything is resolved when things seem to be as bad as they can get for our protagonist, when all seems lost and the antagonist is about to win.
The silver moment, as I call it, is infrequent in fiction but you should recognize it when you see it. It comes just before the black moment. It is the part of our story when, in contrast to the black moment, everything seems to have worked out for our protagonist, when all seems to have been resolved as it should have been and the good guys have won. The silver lining of the cloud that has been hanging over our protagonist throughout the book has, in effect, been found.
In this case, the black moment comes when the antagonist, thought defeated, reappears out of the blue with one last card to play, one last-ditch effort at accomplishing his goal, or at the very least, at destroying those who prevented him from achieving those goals in the silver moment.
For example, in Rogue Agenda the terrorists have all been rounded up by the Feds, the Al-Serhemni family have successfully escaped to Canada, and while Lainie still has an arson/manslaughter rap hanging over her head the reader knows she is innocent and, if there is justice, will be exonerated. But wait...what about the hit man who started this whole mess by trying to kill the CIA agent and has been stalking Lainie ever since? For god's sake, check the closet before you go to sleep!
In th conclusion of my book Presence of Malice the villain, Dr. Gerald Gannery, is wanted by several Federal agencies and our heroes - Jet, Gregory, Patricia, and Paul - are enjoying their victory and have let their guards down. Unaware - but about to find out - that Gannery has found the brownstone where Jet has hidden his paraplegic brother and is aware of the money that his henchman tried to bribe the fixer with...and is now driven by a murderous thirst for vengeance.
The silver moment can definitely be overused. If the reader comes to expect it, it loses its impact to make the black moment come as a greater surprise and seem even blacker. But if used judiciously, it can be an effective tool in bringing a shocking and satisfying story to your readers.