Above Suspicion

This was MacInnes's first thriller (and first published novel as far as I know). It was written during WW2, but it is about a spy adventure the summer prior to the invasion of Poland. A husband and wife team get recruited to check out a spy chain that has become suspect. At first things seem to be going well, but then they get identified by the Nazis and must flee for their lives.

Along the way they meet an American journalist and a British student, each of whom has their own reasons for wanting to strike a blow against the Nazis.

Many of the elements used in the story are typical of MacInnes's later, more polished, work. However, the story is more of an action-thriller than the romantic character-based thriller novels that MacInnes eventually became so good at writing.