One common theme is a race or a competition between the two speedsters. Since both Flash and Quicksilver are known for their super - speed, it's exciting to see them compete in a friendly or not - so - friendly race. Another theme could be them teaming up against a common enemy. They might combine their speed powers to take on a powerful villain.
Fanfiction.net is another option. It has a large collection of fan - created works. However, the tagging system might not be as precise as AO3. But with a bit of digging and using the search bar for 'Flash meets Quicksilver', you may find some interesting fanfictions.
In certain comic arcs, Quicksilver's fate is that of death. But comic storylines can be complex and sometimes characters come back or alternate realities exist where they are still alive.
One of the best Quicksilver stories is his appearance in the 'X - Men' comics. He shows off his super - speed in really cool ways, like running circles around his enemies. His cocky attitude also adds a lot to the story.
One idea could be a story where Nightcrawler and Quicksilver team up to stop a powerful villain who is causing chaos in the city. Their different powers would complement each other well. Nightcrawler could use his teleportation to surprise the enemy and Quicksilver could use his super speed to quickly disarm any traps or threats.
I don't know who the author of the 'quicksilver novel' is. There are so many novels out there, and without more specific information, it's hard to determine the author.
I'm not sure specifically as there could be many novels with 'quicksilver' in the title. It might be about something fast - moving or fluid, perhaps a character with the qualities of quicksilver like being elusive or quick - thinking.
Quicksilver's age can vary depending on the specific comic storyline and continuity. But typically, he's depicted as being in his twenties or thirties.