Who is Astrid Vogel from The Mark of the Assassin: A Novel and what is their importance?

Obsessed with the story of her father's anti-Nazi activities, Astrid Vogel, grew up in Switzerland but returned to Germany, convinced that neo-Nazis still ran the country along with American occupiers. She became a leftist terrorist and eventually settled in Amsterdam, working in a book store and living on a houseboat. She is enlisted by Delaroche to join in his assassinations, because two of the targets are womanizers, and she will be able to lure them into his trap.