Their universes disconnect the moment they make contact, but Marcus knows Pompeii well and escapes the eruption just before it happens. So he can point Ulyses to places where things will be buried or hidden.
I also needed the relationship to go both ways, not just Marcus getting ideas from the future. That makes the plot more interesting.
I also needed the relationship to go both ways, not just Marcus getting ideas from the future. That makes the plot more interesting.