Wolf by Wolf by Ryan Graudin

The year is 1956. Hitler rules and celebrates his Great Victory with an annual cross-continental motorcycle race. Yael. a former death camp prisoner, has one goal: Win the race and kill Hitler. A survivor of painful human experimentation. Yael has the power to skinshift and fulfills her mission by impersonating last year’s only female racer. This deception becomes more difficult when Felix, her twin brother, and Luka, her former love interest, enter the race and watch Yael's every move,