The Star and the Shamrock by Jean Grainger - a final WWII novel for the year

In the first book of this WWII trilogy, a desperate mother in 1939 Berlin sends her children to what she hopes is safety in Britain. Ariella Bannon is a German Jew, married to Peter, a Catholic who was arrested five months ago for defending an old lady from Nazi thugs. She is afraid her husband is dead and is worried for her children: Liesl (10) and Erich (7). There is a chance to get them out of Berlin: a humanitarian effort, Kindertransport, is rescuing children from Nazi-controlled territory and bringing them to Britain.