Danielle Roget's story seems to go something like this: She murdered a few guys in France, and managed to have a few others sent to the guillotine. Eventually, because revolutionary France was unstable, she had to flee with her lover, Philippe Cordier, whom she probably didn't love back: very likely she was just using him as a vehicle to get out of France. Somehow Philippe and Danielle ended up in Collinsport. It seems like a strange place for Danielle Roget to be, but maybe the first ship they could find was headed for Collinsport. I imagine that they planned to go on to someplace more cosmopolitan as soon as possible, but before they could, Danielle caught sight of Peter, and killed Philippe so she could be with Peter. Ben Stokes was enthralled by her (Ben seems to have had a weakness for evil Frenchwomen), so he may well have played some small part in Philippe's murder, though I doubt he knew what he was doing at the time. And then Peter, though initially smitten with Danielle, found out about the murder and decided she wasn't his type. So she went away, meek as a little lamb, and was never heard of in Collinsport again. That last part of the story seems very unlikely. Does anybody know of any serial killings in the US in the late 1790s? Incidentally, Ben's infatuation with Danielle would explain why Professor Stokes was acquainted with her name. Ben may not have known the whole story, but Professor Stokes would have tracked it down once he read about her in Ben's journal, and drawn his own conclusions about how evil she was.
Have I left anything out?