I like reading books about war dogs, shipwrecks, and lady aviators.
This was my least favorite of the series-- although that might be because I read them all so fast and finished this one on vacation. It was a lot of really dark and heavy material slamming into me all at once. I did quite like the conclusion, and the painful decisions that had to be made regarding locks and keys and whispering iron.
There is one bit I'm still really confused about. If you've read the series, maybe you can answer it for me...(show spoiler)