Dune: House Atreides #10 (of 12) — Brian Herbert

Leto, the newly crowned Duke of House Atreides, finally unearths the plot behind his father's untimely death, and suddenly must prepare to stand trial for a terrible crime he did not commit.
And even as Baron Harkonnen's evil plan appears to be working, another coup is underway as Shaddam begins his own coronation as supreme ruler.