By this point in the Murderbot Diaries series, I'm used to the short length of these stories. I appreciate that there's still an overarching plot that the books are driving toward, but the bite-size adventures of the sentient AI robot are also entertaining by themselves. Now that the series is in a good groove by book three, I was glad to see the introduction of a foil to compare and contrast the main character's interactions with the humans.
The rogue SecUnit continues to find himself deeper into the shady dealings of humans, but with each interaction, he's finding it harder to hide who he is and what he's doing. That these "missions" he gives himself are a significant amount of effort for someone who would much rather be lazy and just watch vids all day seems contradictory until you realize that it's great character development—even if it's subtle. Raising the stakes with each book also helps to make this one the best one in the series to date. There has to be a point soon when things become fully out of the SecUnit's control.
It's always interesting to me how the characters that have stuck with me through the series (aside from the main character of course), are the other AIs and robots. In Rogue Protocol, I immediately fell in love with Miki, who showed the other side of human-robot relations as a pet/mascot. The contrast between Miki and the SecUnit was a fantastic plot device and I would love some kind of spinoff with those two characters (or characters like them). Unfortunately, the abrupt ending to this book left me a little disappointed, as I felt there needed to be more time with the characters to get their full range of emotions after the climax.
A great book filled with contrasting human-robot relations, I give Rogue Protocol 4.5 stars out of 5.