Maddie realizes that Anna and Julie were a lot alike: both were (and are) fantastic at pretending, and both used that skill to help a cause they believe in. In this passage, Anna also makes it very clear that it would be foolish to take Julie’s account at face value. Julie was walking a very thin line and, to protect herself and her allies, she had to leave a lot out. There are, it seems, more allies than even Julie realized, if von Linden’s landlady is helping Engel help the Resistance.