Except that the killer becomes a little obvious a little too soon. But it couldn't be him/her/it. could it? Yes, it could. There are two good storylines combined well here so that neither Monk nor Hester, nor Rathbone, who takes over as the main character throughout much of the book, can be sure which case is truly being tried, murder or treason. There is more skullduggery than usual, but it all fits together very nicely.
Hopefully the coming Monk novel will go back to Monk and Hester as the central figures. It makes sense that they are often sidelined here, but they are interesting people that one longs to watch continue developing.