Book 3 and conclusion of the Elemental Trilogy. This was a perfectly fine read and there were a few gotcha moments in the plot, but in general it felt like a neverending chase between the ubervillain and the plucky heroes, in which things were barrelling so inevitably towards the conclusion that you wished they would just get on with it already. All in all, there were enough plot twists and emotional highs to make it a satisfying ending to the series.