Books like Hitler's Secret

Two German teenage refugees are recruited by the British secret service to travel back to Germany to retrieve a young girl. "Otto" is glad to get away from the British boarding school where he has been put by a friend of his father's, after his entire family is taken from his home in Munich because of his father's communist background. "Leni" has been working on a bloodmobile after her mother and sisters have come to London, and is up for the adventure, but mostly wants to avenge the suspected death of her father and brothers. The two are trained briefly and then dropped behind enemy lines. They must travel to a convent on an island, find Angelika, and get her to Switzerland. They don't know who she is or why the British want her, but as their adventure continues, things become more and more clear, and they realize they won't be able to turn her over to the government.Strengths: Wow. This was an excellent war/spy adventure. It could almost be categorized as an "alternate reality" fiction book, because the whole reason for finding and removing the girl from Germany is based on something that didn't actually happen, but it made for an excellent story. Very gripping from start to finish, and very sad as well. Tiny bit of romance.Weaknesses: Perhaps a little violent for younger students, and there are several deaths, but I can't wait to get a copy for my library. Don't know that it can be used for the Holocaust unit, though, because of the fictional premise mentioned previously.