I put a question mark next to the word conclusion in the title of this review because it's not clear if "Shadow Puppets" is the final book in the entire 'Ender's Saga' ('Bean sub-saga'). A large number of issues are resolved in this book, but others are still left up in the air. At the present time, there is listing or information about any future episodes in this series. So, for the time being, I will assume this is the last book. If it is, despite seeming loose ends, it would make a satisfactory conclusion.
"Shadow Puppets" should probably be the end, though. Much like the last portion of "Xenocide" and all of "Children of the Mind" in the original 'Ender's Quartet', Orson Scott Card seems to be running out of steam with these characters. Card still displays his gifts of representing human interactions, but "Shadow Puppets" has less ability to stand on it's own. Unlike "Ender's Shadow" and, to a slightly lesser degree, "Shadow of the Hegemon", you absolutely have to have read the previous books in the series for "Shadow Puppets" to have any true meaning. Whereas "Ender's Shadow" and "Shadow of the Hegemon" were connected by similar characters, yet told different stories (much like "Ender's Game" and "Speaker for the Dead"), "Shadow Puppets" merely continues the storyline from "...Hegemon".
To summarize, Peter Wiggin has achieved his long sought after goal of becoming the Hegemon, but the title carries little power with it in the wake of a large Chinese invasion throughout southern Asia, and subsequent assumption of the position of Earth's premier military power. These actions were set in motion by the psychotic Achilles before his true nature came to light and he was placed under arrest by the Chinese government. Peter sees his only true way of thwarting the Chinese and restoring prestige to the office of the Hegemon is to rescue Achilles from prison and put him to work for the Hegemony. Think that, despite Achilles manipulative skills, he can control him, Peter mistakenly compromises his own security and drives away many of those who served him, including Bean and Petra.
During their self-imposed exile from Hegemon, Bean and Petra try to find ways to undermine the Chinese and Achilles while also dealing with a burgeoning romance and Petra's desire to have children by Bean before he dies of his genetic disorder. While it is somewhat interesting to read about Bean and Petra's romance, it is still somewhat dry. It's not impossible to conceive of this happening, as they are both probably 16 years old at this point and far older in many other ways, given what their early years consisted of. Yet, there's not really any spark to the relationship. It seems to the reader as if they are having this romance because they feel that it's something that they should do, not because there is any passionate romantic feelings sparking between them. It can't carry near the same weight as the personal interactions and tender romance that took place in "Speaker for the Dead". That example is just thrown in as a perfect representation of Card's ability to convey human emotion. It's not quite as well-crafted here. It's not bad, though, so the reader still has some emotional investment in these two.
There are other elements of "Shadow Puppets" that are quite interesting. For the first time in all seven of the "Ender's" novels, the reader gets a chance to truly see the personalities of Theresa and John Paul Wiggins, the parents of Peter, Ender and Valentine. A great deal of time is spent on Peter's reluctant interaction with his parents and his eventual acceptance of their advice as relevant and appreciated. They come across as so much more than the bland, inattentive parents that readers were first introduced to in "Ender's Game". In addition, there are interactions with many other former Battle School students. Alai and Han Tzu are just a few of the names who play major roles in the events that shape this novel.
On the whole "Shadow Puppets" was a good read. If there are more books on the horizon, then all the better. However, if this is where the series ends, then so be it. It's not a bad way to go out.