The fourth of five books in the Quadrail series. Frank Compton and hybrid sidekick Bayta are off across the galaxy to the Filiaelian part of space. I mentioned in my review of Odd Girl Out that the Compton versus Modhri in a battle on the train motif was looking a little tired. Zahn realised this and the Domino Pattern is a classic murder mystery on a train, Orient Express style, though not stealing any significant plot points except the issue of murder in an isolated conveyance. The ongoing plotline of the series stays initially in the background of this book, while the denouement nicely links back to events in the first book. The plot hangs together well and in addition to the twists and turns in the murder mystery of this book, there’s a couple of interesting developments in the ongoing series that sets up the finale to come.