At the age of six, Yael was interred in a concentration camp and subjected to experiments to radically alter her physical appearance. Although the initial intent was to make her look Aryan instead of Jewish, Yael eventually learns to control her shapeshifting abilities and now can mimic anyone she wishes. After escaping from the camp, Yael is taken in by a band of resistance fighters in Germania and grows up to be a formidable weapon in their arsenal. Her shapeshifting allows her to stand in for Adele Wolfe and undertake the grueling Axis Tour motorcycle race with the intention of getting close enough to Hitler to assassinate him.

Yael’s frequent changes of appearance make it hard for her to remember her real identity, so she has placed wolf tattoos on her arm to remind her of all the people she’s lost and the cause for which she fights. Despite her mission to end the Nazi regime, Yael is distracted by her attraction to both Luka and Felix. By the end of the book, she hasn’t succeeded in resolving either romance but does manage to kill another shapeshifter masquerading as Hitler.