A Wartime Marriage, aka Flight from Bucharest, by Mary Jane Staples

Captain Harry Phillips, a British officer, is a prisoner of war in a German-controlled hospital in Romania. It’s 1918 and while Germany has gone from near-victory to an unsuccessful Spring Offensive on the Western Front leading to eventual defeat, its army and military intelligence are still feared. Harry is recovering from being shot in the thigh but has been treated well, so is not worried when he is summoned to meet with the German officer in charge of the hospital, Captain Carlsen.Captain Carlsen has a very unexpected plan: he will help Harry escape back to England if Harry agrees to take Princess Irina of Moldavia with him. The Princess is pro-German and has angered Romanian extremists who are determined to try her for treason. Captain Carlsen admires the Princess and fears for her life when the German army leaves Romania. He asks Harry to agree to marry the Princess on the understanding the marriage would be annulled once she is safe in England. Harry is engaged to Elisabeth, a…