Journey to Munich by Jacqueline Winspear

It's 1938 and Maisie is still in mourning over her husband James' death, but she realizes that it's time to move forward and go back to live in England. Before doing that, Maisie is asked by the British Secret Service to go undercover and travel to Munich to rescue Leon Donat, a British citizen who's been imprisoned at Dachau. Maisie is to pose as Donat's daughter, but her mission becomes even more complicated when she's asked by Lorraine Otterburn to find her daughter Elaine in Munich and bring her out of Germany, too. Maisie has had a complicated relationship with the Otterburns in the past and feels they were partly responsible for James' death. Will Maisie be able to put her emotions aside and succeed in her mission?