This review is for the audiobook:

As usual, Alan Cumming is an absolute delight to listen to. I love how he voices all the different characters (especially Bovril)! This second book in the steampunk series again blasts through at breakneck speed, this time mainly in Istanbul. I really liked that we get more character development from Deryn, the girl who poses as a boy so she can fly on the Leviathan. Overall a really enjoyable listen!