Walking with the Enemy (2014)

Regent Horthy is the leader of Hungary and a German ally, but his favorable standing with Hitler changes as the war comes to an end. Forced to cede Hungary’s power or else witness the execution of his son, Regent Horthy gives up control of his country to the Nazis, who quickly move Hungarians to ghettos and death camps, with no hope in sight. But the despair changes when a young man named Elek emerges. Separated from his family during the relocations and aided by the woman he loves , Elek defies the enemy by becoming one of them. In a race against time, disguised as a Nazi Officer he embarks on a mission to save his family and thousands of his countrymen.

Source: TMDb