Of the first four Alias prequel novels, the fourth novel, titled Sister Spy, is possibly my least favorite (with the third novel, titled Disappeared, probably being my favorite). The main reason why I didn't enjoy Sister Spy quite as much as I have the previous three novels is that it is very slow-paced during a fairly good chunk of the book. The story takes a very long time to get anywhere really significant because there is far too much exposition and setup. Something that I will give this novel, however, is that its author, Laura Peyton Roberts, improved her writing technique since having written the second novel in the series, A Secret Life. Scenes and settings, for example, are described in vividly rich detail. I definitely recommend the novel to fans of the television series (Alias). In typical Alias fashion, there is a pretty major plot twist near the end of the novel, and there are also some ironic references to the television series that one would only understand after having seen it. Page 105 of the novel, for example, reads, "'I hope they don't mind my coming,' she thought, putting on her mask and securing the dive bag to her waist. 'After all, we're on the same side.'" This is the main protagonist Sydney talking about potential ghosts of Pearl Harbor victims, and fans of the television series should immediately recognize it as narrative irony. Even previous fans of the television series, however, should read the novels in order because there are characters and arcs which recur and carry over. I only wish, as I said previously, that the conflict didn't take as long as it does to finally emerge, as there really is too much setup.