Book 2 of Wolf by Wolf
In 1950s Germany, the war may be over, but the fight has just begun. There would be blood. Blood for blood. Blood to pay. An entire world of it. With their mission to overthrow the Nazis in danger, Yael and the resistance are ready to fight. Forced to run, life in the shadows for Yael, Luka and Felix isn't easy, especially when their enemy seems to know their every move. And when each step uncovers dark secrets and even darker truths, each must find a way to navigate right and wrong, past and future, life and death, if they are to survive at all. 
Ryan Graudin