It's a shame that I don't remember what happened in Volume 3 (read too much other stuff since). Katheryn has gathered the siblings together to decide how to deal with Prospero. There's a brief look into the past and plans for the future. A confrontation with Prospero completes the book with unexpected results and consequences which will no doubt appear in the next volume.
Some of the work is drawn is the Belgian-school style of Tintin which makes a nice change but all the artwork is nicely-executed. The story is engaging and interesting and there's more to come. Hopefully I'll remember enough of the plot to appreciate it.