A dossier kept by a former Nazi double agent who dies in the US raises questions about his true identity, as well as the identities of several other immigrants, some of whom gained prominence in US government. Just days after launching a probe into the potentially embarrassing issue Caroline Dupré discovers there is more than government concern frustrating her efforts. She soon realizes that the attacks against her are not those of any government. Then her pursuers, a nationalist, extremist group, changes its plans and decides to let her lead them to the former Nazis, instead of killing her. But little do they know that she has already shifted her probe away from government involvement to their group. The number of living double agents on the list is shrinking fast and Caroline is rushing to find them before they all disappear. Her relentless digging reinvigorates the extremist groups' activities and hurls her onto a path of growing danger and discovery of disturbing facts about her own family.