Zahn, Timothy -- Judgment at Proteus (Quadrail 5) [e-book purchase]

Conclusion of space-train-thriller series with mind-control aliens and politics and plots and betrayals and -- ooh, everything. I've been hoping the author wasn't going to string out the story too far, and maybe it could have been three books instead of five, but no complaints; this is a satisfying finale. Unless you think too hard about all the tech constraints that are supposed to make the plot make sense. Don't do that.

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