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. 

Northern Spy by Flynn Berry

One day, Tessa, a producer for a weekly political radio program at the Belfast office of the BBC, looks casually at a nearby television monitor and freezes when she sees her sister Marian:

She is standing with two men outside a petrol station, by a row of fuel pumps. Her ambulance must have been sent out to a call, though for some reason she isn’t wearing her uniform.

“The police are appealing for witnesses after an armed robbery in Templepatrick,” says the closed caption. A ringing starts in my ears. Only Marian’s face is in view of the security camera, the two men are turned away . . . .

Marian has something in her hands. She is leaning down and pulling it toward her. It takes me a moment to understand what I’m watching, as her hair and then her face seem to disappear. When she straightens, she’s wearing a black ski mask.