When a german soldier deserts he come across a jewish family and together they try to flee the country while being hunted by german soldiers.
First I would say “After” instead of “when”
Second, this is a pretty solid logline, however if you could give the German soldier a ticking clock. Maybe a rondevu point he must reach in a specific time window, that’ll help create more tension and conflict.
Finally I agree with kjk11’s point, use “Nazi” instead of “German”.
Good luck with this, nice idea. Hope that helped!