I've just finished reading The Return, and have to admit I didn't like it nearly as much as The Island. It's set during the Spanish Civil War, and starts out quite well, but then does get rather dull when the war bit starts and it seems to just go on and on about the hardships suffered by people in that period, and the various battles, and how the main characters walked vast distances across Spain to try and escape the conflict.

If you have a particular interest in the Spanish Civil War you would probably find it interesting, but I did find it rather tedious.