Had I not already read Hamer's War by the same author and considered it an original and thought-provoking story, well told, I doubt if I would have bothered with this. Even when I read the dusk jacket blurb I did not find myself particularly drawn. But in the end the memory of Hamer's War drew me back to try A Shadow on the Sun. It is a sequel of sorts, and sequels, as well as book series, have a problem: how do they deal with the information of the preceding novel? Do they simply presuppose that the reader will have read the first book and start from there? In the case of this novel, Cottam has included much of what happened in Hamer's War, retelling the story from different points of view, to the extent that Martin Hamer's life and deeds influence all that happens. There is actually little need to have read the first book. This is not necessarily a strength, as the first book is so much the stronger, and there is a real feeling that there is a good deal of padding here.
Martin Hamer's Polish lover, Julia, has settled in America where she bears his child, a daughter, Natasha, who greatly resembles her father. Both are protected by his American friend, Bill, who has his own demons to deal with. After about seventeen years, Landau, former German prison camp guard and old enemy of Martin and Julia, reappears from the past seeking revenge. There is weird parallelism running between both novels in the outworking of the plot, as well as a sense of anti-climax - I feel Cottam does not exploit his material as well as he might. Yet there are some very well written and memorable scenes: Bill's journey through Mexico and his first meeting with Julia have a real frisson of latent danger while Landau's parallel escape from Russian occupied Poland and Germany really grips the senses. There are indeed things to enjoy here, and I never felt like giving up, but I just feel this novel could have been so much more...